Silicone: Thin with mineral spirits, sheet pour. Wheelchair assist threshold ramp.

A unique design wheelchair assist device for traversing a doorway threshold. DIY the entire project. Total cost, about 20 USD.
Volume of a cylinder=(3.14)r(squared)h, add+10% for waste
Ratio of silicone to cornstarch=10:1, gives about a 1 hour cure.
White spirit (UK) or mineral spirits (US, Canada), also known as mineral turpentine (AU/NZ), turpentine substitute, and petroleum spirits, is a petroleum-derived clear liquid used as a common organic solvent in painting. There are also terms for specific kinds of mineral spirits, including Stoddard solvent and solvent naphtha (petroleum). Mineral spirits are often used as a paint thinner, or as a component thereof, though paint thinner is a broader category of solvent.
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Music courtesy: iMovie

[@janhenke5886]

HI , I am so happy to have come across your tutorial!! I was looking for a cheaper way to make molds and then ... I saw this video on how you made the silicone wheelchair assist threshold. Oh I am so excited because I have a daughter in a wheelchair and this will solve so maybe threshold problems we have in our home. THANK YOU SO MUCH for sharing your knowledge !!!

[@GEOsustainable]

I have never been more thrilled and happy to read a comment. Thank you.

[@TheGrungy1]

I have made the same mistake of starch 1st. As soon as you did it i said oops he goofed. Glad to see you showed the mistake.

[@GEOsustainable]

Yes, I always like to show mistakes so others don't make it. Good eye, I did not realize until I started mixing, then it was too late. I almost deleted the segment and thought I should show it as others would do it too if they don't know. The mistake though was still very cool looking.

[@TheGrungy1]

@@GEOsustainable that's why i have so much respect for you.

[@TheGrungy1]

I have used this method of spirit + starch + paint to make a tentacle monster for an action figure display. It's good and durable. Every one who sees the display bends the tentacles and plays with it. From little boys to grown men. I did have to replace it after the wire broke.

[@GEOsustainable]

@@TheGrungy1 I keep forgetting to add color, as many folks ask if it is possible and/or advisable. Thanks for reminding me.

[@TheGrungy1]

@@GEOsustainable glad to be of help

[@S2BprincessZERO]

im just about to start making models and i think youve saved me $100's of dollars . many thanks for the tutorials :)

[@GEOsustainable]

That is great news!. So glad I could help. Stay tuned, lot's more to come. My latest video may give you an idea, as I am going to use this to make molds for face shields.

[@mariad4183]

It's your generation we must thank for everything we benefit from today!

[@GEOsustainable]

And for the mess we made of the environment. For this I am sorry, and I am trying to fix it.

[@mariad4183]

@@GEOsustainable ...aawww...the fact that we have known neither war nor famine are proof that the benefits far outweigh the messes! We're all in this together💕 God Bless you for being a wonderful example to the rest of us, kind Sir!

[@dbrown1576]

I have used the plastic bag idea to mix up epoxy resin as well. It makes it so much easier to deal with, and I know it’s mixed well. Thanks.

[@GEOsustainable]

I am so glad you like the idea. It does save a mess, and yep, you can see better.

[@SpecsAppeal]

I love this tip, I work with resin often and can't wait to utilize this method, thank you.

[@AS0144]

You are awesome!! Thank you so much!

[@clubhead9242]

Shred the fresh cast through a grinder, it can probably be then used to bulk out the next cast. It works bulking out RTV silicon molds. Do a test if you can first, it might just work!

[@GEOsustainable]

Oh it works alright, I do that with even what I peel off my utensils. It is a great way to recycle. I then use silicone oil to re-soften it. Watch here, I did a video on silicone oil. kzbin.info/www/bejne/eZqVaYxpj5iVj7c

[@clubhead9242]

Many thanks for posting your content , wishing you good health . Best Wishes.

[@GEOsustainable]

@@clubhead9242 My pleasure, thank you.

[@amirned8494]

amazing experience,l will try immediatly.thank's for sharing

[@GEOsustainable]

I am so glad you like. Great to hear.

[@SpecsAppeal]

You are a wonderfully interesting and entertaining person. I really enjoy your content and watching the way your brain works. Clearly very intelligent, just a neat channel. So glad to have found you 😄

[@GEOsustainable]

Thank you so much. I am thrilled you like my content.

[@mariad4183]

You are a genius! The bumps would be good for traction...

[@GEOsustainable]

You are too kind. More like falling over it. I am so glad you like.

[@genericjesus8803]

8:46 the container and zip-lock bag are made out of either polyethylene or polypropylene, 2 plastics that (just about) NOTHING sticks to AND the strongest chemicals can’t break down. Car battery cases are made of it (HDPE)

[@GEOsustainable]

Very cool. Thanks for sharing!

[@lafsmarshall]

@@GEOsustainable Where can you purchase polyethylene or polypropylene containers? What are they commonly used for to give me an idea of where to purchase.

[@bertkutoob]

Have you thought about mixing the corn starch into the mineral spirits first and then adding the mixture to the silicone ?

[@GEOsustainable]

Good thought. I would try a small quantity at first. My thought is that as soon as the cornstarch contacts the silicone, the cure clock starts. When thinning, especially a lot, it takes a good long time to get it to homogenize.

[@bertkutoob]

@@GEOsustainable I was thinking that mixing the cornstarch into the spirits would prevent clumping, similar to when I make a bechamel sauce I whisk the flour into a small amount of water, rather than directly into the butter...

[@GEOsustainable]

@@bertkutoob Yep, good thought. Keep in mind the cure clock and give it a go.

[@kevinreid3330]

Thanks, informative. trying to cast Bondo with the silicone mold. Tried that?

[@GEOsustainable]

Did it work?

[@rickmccaskill7888]

If I don’t use the corn starch will it still cure but slower and flow more to self level. Thank you

[@GEOsustainable]

It will not cure, most likely. Cornstarch cost a buck, seriously, buy a box. You are most welcome.

[@Negrataish]

Hello tried this, I tried this with molds but the pieces are shrinking at least 30-50%, acetic 100% silicone with mineral spirits 10:1 cornstarch. Maybe I put too much mineral spirits?

[@GEOsustainable]

Yes, the mineral spirits, or any additive that evaporates will, of course, lead to shrinkage as the volume of the additive evaporates. Although straight silicone does not shrink, if you add something that evaporates, your item will shrink that amount. You will have to calculate shrinkage to end at the size you want. To add to the challenge, it does not shrink linearly, as in thin sections will not shrink as much as thicker sections. The ramp I made did not shrink width or height, but it did lose a lot in length. I did a later video where I use silicone oil, and it did not shrink, if you wanted to try that. You can also, leave in mold (hold in place) until it dries a few weeks, and it will be the size you intended. I haven't covered shrinkage yet, but I get this question enough to make a video on it.

[@Serkunny]

Could you make a video on what to do with the silicone scraps? I have been saving them, but I'm not sure how to reuse them. Thank you!

[@GEOsustainable]

That is a great idea. I sure will.

[@landas2268]

Hello Sir. Can I use epoxy resin in the molds I make, after I make the mold. Or just clay. (Jewelry maker)

[@GEOsustainable]

Yes, you can use this for making mold for Epoxy jewelry.

[@marjoriefallon4539]

What was the mold release used?

[@GEOsustainable]

The mineral spirits was all I needed, as the form is paper backed foam board. The mineral spirits soaked into the paper. If you use another material you can use vegetable oil, soy wax, or soap. I used soap in this video and show how to apply it. kzbin.info/www/bejne/amaVqmx8hpyUZq8

[@edzu2771]

Hello Friend. One question; Once set and dried, does the mold shrink down eventually due to the naphtha evaporating?

[@GEOsustainable]

Yes, it can. Folks have reported their projects do shrink. It seems it may shrink on the longest side. Although, I still use this and it does not look like it has shrunk on me.

[@silviak1361]

I make silicone thinner with mineral spirits and I would like to know how much time it takes to get in rubber state. I don't know if I put to much mineral but it passes 24h and still liquid and stiky. Should I wait or it's a fail?

[@GEOsustainable]

You should watch the video. You missed something.

[@silviak1361]

Thanks.I saw it know ...well...i'll take my messy stuff without the korn stach and try to clean the objets and remake all again(becouse its liquid )with 10%of korn stach. Or i'll put everything in the trash and try it again next week🤔 Thank you very much.you're a very good teacher😃

[@silviak1361]

Well...my 1st experiment was a totally failure cause I mix to much mineral spirits.and then rebuilt the formula and had 45gr of corn starch and it still stayed liquid .so...I did a big messy cause I didn't use the bag. In conclusion and keep in mind for next time:use the bag;mix 100ml of spirits to 300ml of silicone.and had 25gr or a litle more of corn starch. Is this rigth? This is my future plan.i'll update you then.

[@dorisjimison7590]

@@silviak1361 He doesn't answer any questions that would pertain to ratios of the silicone, thinner and corn starch.

[@amanwithhiscigaretteandcof3474]

Your knowledge for this silicon mold is GOLD. Thank you for sharing this. 🥰 Sir, do me a favour. Pls give me a link of your video that show silicon dont shrink after cure. Best regard.

[@GEOsustainable]

I am glad you like. I will be making a new video on the shrinkage of silicone when thinned, stay tuned.

[@amanwithhiscigaretteandcof3474]

@@GEOsustainable 😤 i will and i definetly wait for it. thank you Sir !!!

[@PghFlip]

Nice Video! If the mould wasn't asymmetrical (or was built to be reversed), couldn't you have used the bottom of the mold as the finish surface? Would likely have worked for the lumpy pour as well, but the tip of thinning the solution before adding the accelerator is superior.

[@GEOsustainable]

Yes, you are right. And you caught me, I made the mold backwards and upside down. Typical carpenter brain drain. Glad you like. I want to do this again and add a wood spine. Stay tuned, and I will likely get the mould right this time.

[@cahmetrawillis2884]

Ok . If i make a mold using the items above. Can i fill wirh cement for a stepping stone??

[@GEOsustainable]

Yes, absolutely. A perfect mold for cement.

[@cahmetrawillis2884]

@@GEOsustainable thank you so much for replying.. you're awesome... i want to make molds for stepping stones because theyre so expensive... thanks

[@joemoore3385]

Hello, love your videos! There’s a project I want to do with clear silicone that I’d like to add acrylic paint to give it some translucent coloring. Will the cornstarch make clear silicone opaque/ not transparent anymore?

[@GEOsustainable]

That is going to look amazing! I don't really know. It may. Try a little first. I should add this to my next video. Thank you for watching, I am thrilled you like.

[@joemoore3385]

@@GEOsustainable thanks for getting back to me:) is there a way to message you privately like on Instagram or something? I’d like to share my project idea with you.

[@GEOsustainable]

@@joemoore3385 You can email me, old school maybe, but it works. [e-mail]

[@joemoore3385]

@@GEOsustainable email sent :)

[@tokagehideto]

I'm really curious, do the silicon+naphta mix shrink with time?

[@GEOsustainable]

Great question. They do not. I have been using this device daily since I made it and it is the same as the day I removed it from the mold.

[@tokagehideto]

@@GEOsustainable this is great! Do you have a "recipe" for your silicon/naphta/corn starch mix or do you make it by eye?

[@dorisjimison7590]

@@tokagehideto I was hoping he would have answered that. have been reading the comments to see if he had put the info here. Hey! GEO! What's the ratio???

[@tinaknutsen]

Will this work to make a mold of my rubber front doormat? Would i need to oil the doormat? I am trying to figure out how to make a mold of the doormat to poor cement into so i can use in my garden.

[@GEOsustainable]

Yes, this will work perfectly. Yes, I would recommend dish soap as a mold release in this application. Watch here to see how to apply soap. kzbin.info/www/bejne/amaVqmx8hpyUZq8

[@tinaknutsen]

GEO sustainable thank you for your quick response! I have been searching to try and do this for a few years. Thank you for the inspiration and confidence to proceed ! Also appreciate your recommendation on the mold release! Keep the videos coming. Subscribed

[@tinaknutsen]

GEO sustainable watched the video that you suggested. I have another Question? You used the dish soap over a clay mold in the video that you just suggested; so will the dish soap work on the rubber door mat with using silicone instead of clay? The doormat is standard rectangular size. Should I build a box around the mold when I go to pour the concrete...I think I want it to be 2-3 inches thick.anymore suggestions/recommendations are greatly appreciated! Feeeling a little intimidation , so I think ill need a supply list so i can take on this challenge.

[@tinaknutsen]

GEO sustainable also what type of material do you suggest for making the box? The mat has a cut out design, therefore it has openings and isn’t solid flat mat.

[@GEOsustainable]

@@tinaknutsen I am so glad you found my channel. I hope to bring you lot's of really cool projects.

[@LT72884]

Ok, now, i have never seen 100% pure silicone that is white.. its always clear at my store. Is there a specific brand that sells white 100% silicone? Or is that a different type your using? Thanks again for this. Going to use acetone first since thats what i have hah

[@GEOsustainable]

Most hardware and home improvement have 100% white silicone made by DAP. Others make it, it is pretty common. I use the type that evolves Acetic Acid during cure.

[@chandramartin3082]

At what point did you add the corn starch the 2nd time? I never saw you add it. Love your channel!

[@GEOsustainable]

Right after I blended the silicone and mineral spirits. Make sure those are mixed well first.

[@chandramartin3082]

GEO sustainable thank you so much! Doing a project tonight and just rewatched to make sure I remembered how to do this. If I wanted to add color, when would you suggest doing that?