Mold Building Secrets: Unveiling the Step-by-step Process-Part 3

So, you want to know how a fiberglass mold is built? Well good, because I am going to show you how to get from an idea to a custom molded fiberglass part. Once you understand the basics, the sky is the limit for what you can build! We are building a Key West style Hardtop for our custom built 29 ft hybrid bay charter boat, and you are invited to our family's boat shop for a step-by-step tutorial on how mold building is done. This video is for the DIYers out there that want to build their own custom molded parts, from hard tops and consoles, all the way up to boat hulls!
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/ fishbumptv for consultations
Orca Composites Air Dry Coating & Gray Sanding & Surface Primers can be found @ www.fiberglasswarehouse.com use code FISHBUMPTV for 15%off your 1st order.
_________________________________________________________________________ If You find this video helpful, please consider liking, sharing, commenting, and subscribing to the channel. Thanks for watching!
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[@Cptnbond]

It feels like I'm an apprentice in your shop. It's such a well-explained process for us novices. Thanks for putting in all your efforts and making the episodes valuable.

[@FishBumpTV]

Wow, thanks! I really appreciate you watching and commenting!

[@locryStudios]

Me too!!! Im absorbing every word! Perfect pacing, walkthrough, and explanations. :)

[@RezziOutdooringandRVing]

Best most professional boat building repair channel out there. I am going to be working on restoring an old 78 BWhaler Squall. Have lots of info on how to go about it. Thanks keep up the good work!

[@FishBumpTV]

Wow, thank you so much! I wish you the very best with your classic Boston Whaler project and I appreciate you watching and commenting!

[@tylerthomas8953]

Videos are awesome we watch them at school in our fiberglass class because our program director won’t bring in someone as good as you.

[@FishBumpTV]

Haha, that great! Glad you all are enjoying the vids. Tell everyone I said hello and thanks for watching!

[@dallaskia6916]

👍👍👍 Excited for the next episode!

[@FishBumpTV]

Thanks, coming soon!

[@dallaskia6916]

@@FishBumpTV sounds good! Notifications 🔔 are set! 🤙🏾

[@PaPawsWorkShop]

Brings back some not so fond memories of late night spraying in a open shop and the flying insects attracted in by shop lights and finding the newly sprayed surface 🤪

[@garysnyder6020]

Or spray a perfect job, turn out the lights and retire only to return in the morning and find that one bug that walked all over the paint.

[@FishBumpTV]

Yep, that's the worst! I don't know for sure what they were, but it was about 1000 of them! Shut me down for the night, that's for sure. Thanks for watching and commenting!

[@locryStudios]

Im absorbing every word! Perfect pacing, walkthrough, commentary and explanations. :) Just epic!

[@FishBumpTV]

Wow, thanks! Glad you are enjoying the videos!

[@danahawthorne1633]

Thank you Captain. Solid information.

[@FishBumpTV]

Very welcome! Thanks for watching!

[@conniemuller2064]

Thank you so much from South Africa!

[@FishBumpTV]

You are very welcome! Thank you for watching all the way from South Africa!

[@MexicoPescadoro]

37k Cap. You guys are doing an amazing job. Keep it up!

[@FishBumpTV]

Haha, yes Sir! Thanks for your support of the channel, I truly appreciate it!

[@landontakeamericaback2106]

Your thorough and complete educator. I’ve winged through some small repairs and projects on my own vessels, always fair at best.My confidence level has been increased 100%.Your videos will be a good reference if & when I ever take on a project.

[@FishBumpTV]

Thank you kindly! I really appreciate your comment and I am glad to help!

[@Unknown_Random_Guy]

I am enjoying your channel. I have breathed enough fiberglass sanding dust over the years! I am happy that the dust stays in your shop now and can't pass across through my screen! 😂 I a new subscriber...

[@FishBumpTV]

Haha, I hear ya Man! Thanks for watching, and welcome to the channel!

[@user-fk6cx6xw1u]

Capt Joe Fish bump family every video keeps us coming back learning so much appreciate y'all your time is so valuable to me and I am all to familiar with yellow flies in the low country of SC they will find you and leave you with their lasting impression ,Lol

[@FishBumpTV]

Glad that you are enjoying the videos and that you are finding them informative! Didn't know you had those yellow flies in SC. They make it miserable for us this time of year, then you try to paint and the love bugs come out! I tell people we have a different bug for every month of the year down here Thank you for Watching and commenting, I really appreciate it!

[@davewheeler5850]

Another awesome tutorial, thanks Captain Joe👍🇦🇺

[@FishBumpTV]

Glad you enjoyed it! Thanks so much for watching and commenting!

[@samuelserra294]

Thanks, Joe. i really enjoy your videos. you're a cool respectful down-to-earth guy with a ton of practical knowledge. I appreciate that you seem to video exactly the way you would do things without being videoed. For me that is part of your appeal. Reality is everything 👍

[@FishBumpTV]

Wow, thank you so much! I really appreciate your comment, it means alot to me!

[@Picasofly]

Hooking a shop vac up to the exhaust port on your your electric DA works wonders. My garage was a dusty disaster before I did it.

[@FishBumpTV]

Thanks for the suggestion and for watching!

[@dalemurphy1854]

Really amazing job we watch you in class you are teaching us a lot of new skills

[@FishBumpTV]

Wow, I appreciate that! Please tell everyone in your class that a said thanks for watching!

[@alangood8190]

Another excellent video to add to your impressive library of work. Really looking forward to the next episode.

[@FishBumpTV]

Many thanks! I appreciate you watching and commenting!

[@1267josh]

A video on spraying would be great. Thanks for the details in these videos.

[@FishBumpTV]

Thanks for the suggestion and for watching!

[@tonisallese7173]

I’m really appreciating this series, thanks.

[@FishBumpTV]

Glad you enjoy it! I really appreciate you watching and commenting!

[@johnkurtz-fh5hx]

Great videos! I appreciate the time you’re taking to produce them!

[@FishBumpTV]

Glad you like them! I really appreciate you watching and commenting!

[@bjorn3811]

Crazy 10 plus years watching videos this is the first series I was when is the next episode coming out

[@FishBumpTV]

That's awesome! Glad you are enjoying the videos! Thanks for watching and commenting!

[@user-le1bu2go2y]

Thanks again I really enjoy learning from you.

[@FishBumpTV]

Glad to hear it! Thanks for watching and commenting!

[@jimclark2824]

More please 😊

[@FishBumpTV]

Haha! Ok!

[@tonyg1958]

Enjoying this series a lot, and learning a lot as well. Can't wait for the next installment!

[@FishBumpTV]

Glad you enjoy it! Thank you for watching and commenting!

[@AkilAgorillA]

Amazing work.

[@FishBumpTV]

Thank you very much!

[@HeyUncleArt]

Again awesome! Thanks!

[@FishBumpTV]

Glad you liked it! Thanks for the comment!

[@hecdc7703]

Plug's looking good. Good old surface prep consists of three main steps: sanding, sanding and more sanding. I like the Evercoat putties, they're easy to use for us DIY'ers. Thanks for the great video.

[@FishBumpTV]

Thanks! Haha, yep, lots of sanding for sure!

[@fretinit]

Capt. Joe has always joked he's just a professional sander LOL🤣

[@martylasher539]

Thanks for making these videos to de-mystify work with resins. I like the down-to-earth approach.

[@FishBumpTV]

Glad you like them! Thank you for watching!

[@melvinrawlings1457]

Great job on teaching us how to do so build. Such an in depth video and much love to ya from Maryland❤❤❤

[@FishBumpTV]

Thank you so much 🤗 I appreciate you watching from Maryland!

[@jimferry3509]

thank you, very informative

[@FishBumpTV]

You are welcome! Glad to help!

[@ProtoPoly-PH]

I am new to your channel, just subscribed yesterday. I just watched your entire boat building playlist in 2 days. I am starting to build a trimaran here in the Philippines next year and stuff like you are showing helps me a lot.

[@FishBumpTV]

That's awesome! Welcome to the channel and thanks for watching all the way from the Philippines 🇵🇭!

[@ProtoPoly-PH]

@FishBumpTV I really enjoyed your content. Would like to see some content on working with foam core if your looking for ideas.

[@midlanticfishing5405]

Phenomenal!

[@FishBumpTV]

Wow, thanks so much!

[@davidyork751]

Great video, Joe. I can't wait to see you lay up the mold, then lay up a part, then pull it.

[@FishBumpTV]

Thank you! More mold building how- to coming soon!

[@scottf6604]

J. Prep is everything! Joe your next level. Thanks

[@FishBumpTV]

Thank you so much! I appreciate you watching and commenting!

[@roue20ca]

Great channel, and yes, please do a video on spray gun setup.

[@FishBumpTV]

Thanks for watching and for the suggestion!

[@PatrickHoodDaniel]

Another wonderful episode. Looking forward to the next.

[@FishBumpTV]

Thanks so much! More videos coming soon!

[@walkertongdee]

I use both those Huchins, they are next-level industrial-grade tools, worth every penny.

[@FishBumpTV]

I agree, they are awesome tools! Thanks for watching and commenting!

[@user-le1bu2go2y]

Hope you show us how to build a live well mold soon.

[@FishBumpTV]

It's the same principle, just a different shape. Once you have the overall concept, you could build almost any shape you want! Thanks for watching and commenting!

[@lpdriftn]

Love and really appreciate the vids mate thanks

[@FishBumpTV]

No problem 👍thanks for the comment!

[@tropicrows]

You're doing a great job. I'm just enjoying watching your videos. Having done some glass work and built a couple of small moulds, I can appreciate everything you are doing. I know know one thing: you're never to old to learn. 😊

[@FishBumpTV]

Thanks so much! That's very cool that you have some experience in this area, most people don't know much about it at all. Happy to share with you all out there watching!

[@aloissuter1071]

Awesome content as always Captain! Bravo 👏 Thanks again for all your hard work! Us DYI guys and gals are Loving it

[@FishBumpTV]

Wow, thank you so much! I really appreciate your comment and your support of the channel!

[@user-xu6zt8uz7c]

I really appreciate you sharing your knowledge and experience . I need all the help I can get for my own diy project. I'm in ft myers fl so I also have to deal with heat and humidity and bugs. Thank you.😊

[@FishBumpTV]

Glad to help! Oh man! The heat and the bugs are ROUGH!

[@gynat5968]

Hutchins Hustler is arguably the best in class straight line sander out there.

[@FishBumpTV]

I agree! Hutchins air tools are VERY good! Thanks for watching and commenting!

[@andrewiannello6548]

Nice work Joe, I can see you've buttered a few parts in your time👌Keen to see the next episode

[@FishBumpTV]

Haha, thank you! Yep, definitely went through lots of fillers and putties in the boat shop!

[@jonnooney7102]

One thing you could do a video on is all the various sanding discs there are out there and the type of pads that go with which ones, the types of adapters to use with the electric grinder. This was much more of an aggravation to me than I ever imagined when I started and I purchased a lot of things that just didn't work very well. The 36 grit small disc on the electric grinder are my workhorse now when I have a lot of material to cut.

[@FishBumpTV]

Thanks for the suggestion! I agree with you on the small high speed grinder with a 36 or 24 grit disc. They are hard to beat when it comes to rapid material removal. I call them your boatbuilders friend! Thanks for watching!

[@mikeburke3508]

Thanks for the last couple of videos you've done, they answered a couple of questions about fiberglass repairs and different resins. I'm not new to fiberglass and plastic repair on cars but could never get good answers from any of my vendors and product reps. ( Including my 3-M guys) Thanks Joe !

[@FishBumpTV]

You bet, glad to help! Thanks for your support of the channel!

[@reidwoods3194]

Cool

[@FishBumpTV]

Thanks! I appreciate you watching

[@WereAllThatBored]

High build primer is what separates pros from DIY folks. If you can finish it to a mirror that is what makes the plug gold!

[@FishBumpTV]

You got it! Thank you for watching and commenting!

[@melinda5777]

I'm enjoying the different steps for this build.

[@FishBumpTV]

Glad you are enjoying the videos and thanks for watching and commenting!

[@melinda5777]

@FishBumpTV Sure, no problem. I'm glad your sanding and not me! LOL. How's your Brothers boat going. Bottom jobs are #%^^&%$$ LOL.🤣🤣

[@byronsmith1947]

Southern Style, lub that big wall fan... good show!

[@FishBumpTV]

Haha, yep! Thanks!

[@megajointen]

Hello Joe Im not sure but bosch make some White sandpaper for paint, i can’t say for the polyester but the name is paint paper it’s White and when sanding paint and varnish it do not stuff the paper like that, if you Can find it in the States you should try it.😉 Again thanks for your great teaching videos👍👍👍 Best regards from Denmark Thomas Thomsen

[@FishBumpTV]

Thanks for the suggestion Thomas, and I appreciate you watching all the way from Denmark 🇩🇰!

[@ainsleyisrael6603]

I find you can unclock your sanding discs with a wire brush if you are in a pinch.

[@FishBumpTV]

Nice tip! Thanks for watching!

[@howellgrange8257]

Another great episode 👍👍👍👍

[@FishBumpTV]

Thank you so much! I appreciate your comment!

[@Close_Call]

Yasss, lovely timing. Thank you.

[@FishBumpTV]

You're so welcome! Thanks for watching!

[@wilsonevans6760]

Quality work and advice as usual.. Have enjoyed watching you progress!

[@FishBumpTV]

Much appreciated! Thank you for watching and commenting!

[@user-le1bu2go2y]

If you will put a shop rag in between your hand and your sanding surface it will show you any inperfections

[@FishBumpTV]

Thanks for the suggestion and for watching!

[@ketchgreene7492]

Excellent as always. Do we get to see the below decks on Mark's sloop? The on water and in kitchen time is great.

[@FishBumpTV]

Thank you! Sure, there will be more of Mark's Tayana sailboat project coming up soon for you all!

[@danielo9979]

Hey, just found your channel and like it. Like the scotch brite and acetone trick. As an amatuer hobbyist i (just always ragged with acetone). Also dont have a big compressor either. Wan to tell you about a tool option i found to be perfect for this type of work. The 7 inch polisher/sander from harbor freight called warrior. 650 to 3500 rpm pressure sensitive variable rpm non orbiting with 7 inch foam stick it velcro pad (also use the 5 inch too) Fiberglass dust burned out my 12 thousand rpm grinder one day and grabbed the warrior as the last act of desperation. I'll never buy or use a 4 inch angle grinder ever. The warrior sands great and is very forgiving. with a wool pad if buffs awesome, with a cut off wheel it slices thru fiberglass, wood, steel, aluminum like butter and doesnt grab yank twist and explode cut off wheels like the 12000 rpm 4 inch does. The pressure sensitive feature lets you get surgical, get inthere and lean on it and the motor torques like hell to the rpm you set it for. Inexpensive and worth a try, bet you like it. Great how to make mold series, thanks ! Oh yeah the love bugs only come out when spraying coatings paint and especially gel coat

[@FishBumpTV]

Welcome to the channel! Thanks for the suggestion on the variable speed grinder/ buffer, I will have to check that one out. I have a Bosch grinder that sounds very simular to what you are describing, but always looking for good options! The high speed grinders can take some getting used to for sure, and may not be the best tool for everyone. Haha, yep! The dreaded love bug!! They have messed up many a gelcoat job. Thank you for watching and commenting, I really appreciate it!

[@doug2202]

Damn good video Capt. Keep them coming. What’s the working time on each batch of the primers

[@FishBumpTV]

Thank you very much! The working time is alot like gelcoat. I try to have it out of the paint gun in 10 minutes or so. Clean the equipment, and load the next batch. Of course it can vary based on catalyst ratios and air Temps. I hope this helps and I appreciate you watching!

[@Andrew-lk5ov]

Another very nicely done and informative video. Thank you. Question: Is there a particular reason you chose not to add reinforcing ridges to your plug? Obviously more work, but could add some lengthwise stiffness to the final top. BTW, I am completely astounded at how clean you keep your clothing!

[@FishBumpTV]

Thank you very much! That's a good question. This design is surprisingly rigid as it is. I have built other plugs and patterns like this in the past and knew it would work just fine for this application. I try to show what works for me, but always encourage you all to add or improve where you have a thought or idea to make something your own. Haha, I get the clean clothes thing a lot! I guess the more you do it, the easier it gets to keep clean!I hope this helps and I appreciate you watching and commenting!

[@Fonsan]

What is the diameter of the nozzle of the hvlp gun you are using? When spraying gel coat which nozzle size would you recommend?

[@FishBumpTV]

A 2.0 or a 2.5 is what I use most of the time. Thanks for watching @

[@boattothefuture]

Great video! Could a peel ply be used to gain a smoother surface finish, therefore less sanding required, or is that not possible with these polyester based products? Really looking forward to the rest of this project 😊

[@FishBumpTV]

Glad you are enjoying the videos! Yes, peel ply could be used in some of these applications. I will try to add some peel ply content into our videos soon for everyone. Thanks for watching and commenting!

[@albrooks244]

I have a fish box on my boat that needs insulation. What would be the best material to use for insulation and how should I fiberglass and finish it? Would like to see a video on this. I can’t find a good one on KZbin.

[@DanielJumalon]

Love the videos. I know you said you get a lot of questions about the foam. Can you point us in the right direction for purchase? Currently planning/designing a fish box and haven’t found a foam that doesn’t melt from the resin heat

[@FishBumpTV]

I get our 2 pound density foam from one of our local fiberglass suppliers. I know that it is difficult to ship this particular type of foam, so it is hard to find online. Thanks for watching

[@poepflater]

i'm not a big glazing putty fan, it seems to keep shrinking with time and can be very noticeable after some time has past.

[@FishBumpTV]

Some glazing putties are better than others. Many people think of the one part putty, that comes in a squeeze tube. I don't personally use that on anything in our shop. The evercoat 2 part putty on the other hand is a good material. And remember that the part we are building is just the pattern for the mold, and will be a one time use, and will never be exposed to the elements. I hope this helps, and thanks for watching!

[@Junkuroni]

I have a question off topic of this video just going to leave it here as I would assume you check the newest videos for questions. I have a houseboat and when I tore out the inside walls of the cabin(not hull walls ) I found some old screw holes have been leaking inside the wall and rotted some of the outside walls wood backing. I'm going to cut out rot in wood and replace with fiberglass patch. What would you use on the backside of the exsisting fiberglass that is polyurethane? Some have told me to use epoxy for better adhesion but it seems to me if it was polyurethane initially why not use the same material?

[@TLCBB]

hello, I would like to know if fiberglass and epoxy go on a thin sheet plastic mould

[@donaldduck136]

What's the rationale for making a mold. Is it to make the final product lighter or so more so you can reproduce the process for multiples of the ssme plug? Love the content btw!

[@FishBumpTV]

Generally a molded part is a higher quality part. And yes, it also makes building more pieces of the same part much easier and faster. Thanks for watching and commenting!

[@pedrobalduci7754]

if i add wax to a laminating resin that stays tacky, can i sand it? or will it still gum the sanding paper?

[@jameskerry5581]

is automotive 2k high build primer as suitable product for me to use on my plug project?

[@FishBumpTV]

I am not sure if that will work or not. I do know that the orca primers that we used in the video are designed specifically for building molds. I hope this helps and thanks for watching!

[@darrendayton288]

Thanks for sharing your knowledge. Only problem i have with you is that you make things look too easy. Just kidding, your experience shows even in the simplest of tasks.

[@FishBumpTV]

Haha, glad you are enjoying the videos! I will try to make it look a little more difficult in the next videos! Thanks for watching

[@user-dv7hb2sc9m]

Curious, would you say you use the "tackier/gummy" resin on stuff that will be getting another coat or a final fiber-glassing over it or why would you use that? Sandpaper is not cheap but I'm asking b/c I just came upon 4 tubes like are used for flotation on a houseboat. Since I'm on a large lake(7th largest manmade lake) your show came into my feed at the right time. I might find myself building a houseboat. Nothing fabulous but livable, perhaps? Anyhoo, This is my "fiberglass" school , ty Teacher

[@FishBumpTV]

Yes, we always use laminating resin, which stays tacky if we are going to be adding more layers. If we wanted to sand or finish a area we would add some wax additive to the last coat of just plain resin or gelcoat to help it cure tack free. I hope this helps, and best of luck with your houseboat project!

[@user-dv7hb2sc9m]

@@FishBumpTV thanks & there's so many different products that I'm confused right now but I've got time before spending money. I'll be taking notes

[@user-le1bu2go2y]

How many times can you use a mold ???

[@FishBumpTV]

Potentially hundreds of times is you maintain it well. Thanks for watching

[@malmotumotu5218]

Where do you buy those sander from? The 3 blades one

[@FishBumpTV]

We have a link below the videos description for those airtools. Thanks for watching

[@malmotumotu5218]

@@FishBumpTV thank you so much🙏🏽🙏🏽🙏🏽

[@danlucci9246]

Joe, you used both the tooling and laminating resin. If I understand correctly both are laminating, i.e. don’t fully cure when exposed to air, so what is the difference and where would you one over the other. Thank you for your channel.

[@jbaasdad]

ISO resin is stronger. But many times, ortho resin is strong enough. Ortho resins do shrink, whereas ISO resin doesn't. That is the main reason to use ISO.

[@danlucci9246]

Thank you for your response.

[@benorlowski3825]

😎

[@FishBumpTV]

Thanks for watching!

[@zx001961]

I have a question getting ready to do some gel coating in about a month with wax will it hurt to add extra wax additive to it

[@FishBumpTV]

You can add more wax, but I would recommend not adding more than 1 to 2 percent to gelcoat that already has wax added. That would be 10 to 20 CCs per quart. Hope this helps and thanks for watching!

[@zx001961]

@@FishBumpTV awesome thank you I was wondering about that

[@patrickhoins8333]

Always practice the 7P’s with any project Prior Proper Planning Prevents Piss Poor Performance😂

[@FishBumpTV]

Haha, you got that right! Thanks for watching!

[@timothypalmer454]

What grit paper did you use to final sand the sanding primer? .. Bugs seam to love landing on wet paints and primers.🦟🪰

[@FishBumpTV]

I did a knock down with 80 grit, then finished with 120. The surface primer flowed out really nice over the 120. Thanks for watching!

[@josephpurdy3342]

Just found your channel this morning and have been binging since it's raining here today. Great show you have!! Was watching the previous video and this popped up now. Timing is everything. Thanks for the videos I have my note pad out as I'm about to start fixing up my first boat now!

[@FishBumpTV]

Welcome to the channel! Glad you are enjoying it and thanks for watching!