Casio F91W Hydro Mod - Filling My Watch With Tinted Oil

Giveaway!
Yes. This watch will go to one of you. Where ever you live, you'll get it. You need to HIT the Subscribe button and follow me on instagram @bytechsas. I will select one of you randomly on 5th of April!
Filled my Casio F91W with oil to make it water proof. People call it hydro mod and in theory it works and there are people on the internet who proved it. bit.ly/2UmSt1I
I have no need for a watch that can survive on the bottom of the ocean... But if it can look cool... Then I want one.
It can look great. Mineral oil used to fill watches can be tinted in any color you can imagine. You need oil based dyes to do it, food coloring will not work. I chose blue to match the face and I cannot be happier with the result.
Thanks for watching
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[@Wagner669]

@0:09 I think we all know what you are going to do with all this money.... MORE CASIO WATCHES!!!!!!!!!!!!!!!!!! 🤣🤣🤣🤣🤣

[@Techsas]

Definitely!

[@Wagner669]

@@Techsas did you forget to press the light button or I missed it? BTW very nice video! And I absolutely like the result! The shade of blue of the screen matches the face of the watch. Though.... during a battery swap you will have to do everything all over again!

[@Techsas]

@@Wagner669 Thanks! The light is just as bad as it was so it didn't even come to mind to show it on video.

[@fireaza]

"That's the exact opposite of how the water-proofing is supposed to work!" -Casio Engineer

[@Techsas]

"Yes" - Me

[@SemiDad]

Watch is now waterproof to 1000m 👍

[@Provo647]

The background music is really disturbing and makes it hard to watch video.

[@General_Mills_]

I like to have the back cover submerged and pointing inside up before turning it over under the surface and screwing it on. Because it is embossed, it is really easy to trap air under it when lowering it under the oil.

[@Myaccisbanned]

I wonder if there is fluorescent colouring, you'll never need the light again

[@besim109AOG]

damn brilliant idea

[@masnidebelicrnac]

Sometimes my genius... it generates gravity

[@buffbattleboy9569]

Yeah you can deffo get florescent inks, not sure if the medium it's suspended in matters beyond it not being water based

[@tghartman321]

You can also add lume powder to the oil soultion. It wouldn't affect the coloring, but would cause it to glow in the dark like a Timex Indigo.

[@shirok6738]

wow great thinking

[@AxelGuittonneau]

Now give it to a watchmaker and ask for a batterry change :D

[@alainleal6021]

Para qué, si la batería dura más de 7 años y el reloj cuesta 15 usd

[@gregjay6244]

I love it, the color matches the face so well! Keep up the good work, I've been following you for a while!

[@Techsas]

Thanks! I think so too. Stay safe!

[@vibinoutside]

Love how you filmed this. Loved how the mineral water squirts and dye drops were to the beat. 😂 Maybe we're spectrum brothers because how is noone commenting on the pure gold of this edit

[@zaqssb2725]

Nice video.. And that retrowave soundtrack is really legit👍👍

[@FazerWiz]

Does the alarm still sound as loud (or work at all) when it's oil filled?

[@LysanderLH]

Fury and outrage as man puts watch in blue oil for no apparent reason.

[@mat608]

kzbin.info/www/bejne/oqW6ZYWjl62So6c G-Shock

[@BrandonBeans]

Nice build video. Great music! I'll play this on repeat today

[@Techsas]

Glad you like it!

[@dixonqwerty]

Wow that's a radical mod lol. Looks cool!

[@AERHEAD]

Very cool! Looks awesome!

[@Techsas]

Thanks!

[@masnidebelicrnac]

I like how video immediately shows second attempt 😂

[@pepebel2809]

Fantastic job!

[@mat608]

kzbin.info/www/bejne/oqW6ZYWjl62So6c G-Shock

[@shawnburns8190]

UV led replacement and fluorescent dye in the oil!

[@kdt85]

That looks great

[@jeand3967]

Grandioso experimento... Saludos desde la cuarentena en Perú

[@Techsas]

Thanks! Hello from quarantine in UK

[@kevinhooper2787]

Looks nice bunjee .

[@rodrigofuenteszuloaga7856]

Capisimo!!! Te pasaste! Great Job.

[@mat608]

kzbin.info/www/bejne/oqW6ZYWjl62So6c G-Shock

[@engels1978]

Great job! 👍

[@mat608]

kzbin.info/www/bejne/oqW6ZYWjl62So6c G-Shock

[@wza360]

oh wow, painting oil to make a filter - awesome idea~!!

[@et4722]

Can you press the buttons of a hydro moded watch ?

[@aromaticsnail]

How does the screen look like when illuminated? I was looking forward to see it on the video

[@Techsas]

It doesn't look any different, the light is shit

[@nicodemusbell1736]

What about modifying a watch with the el lighting, does it still work?

[@Techsas]

@@nicodemusbell1736 The only way I know how to put EL in F91W is to swap it with SKMEI module.

[@Wagner669]

@@Techsas is it possible to change the light with something better? unsolder the el-cheepo light casio uses in order to keep the price low and then, solder a better quality LED

[@Techsas]

@@Wagner669 Yes. Also the original LED is pointing up, you can solder to point to the LCD and that already is much better.

[@repentbeforeitstoolate..8239]

Looks a lot better.😳

[@jayama125]

This looks amazing and I’m thinking of doing this my self. I wonder if glow powder could be added to the oil, that would be cool.

[@mat608]

kzbin.info/www/bejne/oqW6ZYWjl62So6c G-Shock

[@akshatkhedekar8561]

Did it worked ?

[@Laennec568]

Bumping

[@sayedkhalidkameli9742]

Amazing simply outstanding 👌

[@Techsas]

Thanks

[@issoydegooys2376]

And how do you replace the battery if the power is week...

[@azhdarchidae1422]

Would this dye work with silicon oil?

[@caror0]

Hi Techsas, what is the purpose of constantly shaking the case with the tweezers @ 3:10 (around-about)? Is it just to get the LCD component into the case, or is the extra shaking also to get rid of bubbles? Thank you. Also did you have any tips to avoid bubbles in the front of the LCD? Thanks

[@Techsas]

Hey, the shaking is to avoid bubbles. If there was any bubbles under the module then shaking most likely helped to get them out. Other than that jus try and do everything slowly rather than dropping it in the oil and you should be good.

[@caror0]

@@Techsas Thank you! :)

[@caror0]

@@Techsas Thanks for your tips！

[@zabdielalvarez5285]

LORD CASIO MOD´S!!! SALUDOS, AMIGO.

[@Techsas]

Thanks!

[@NK-ng2vg]

Hey that's awesome!. Can we do this on a g5600 G-Shock model? (With solar feature) have you tried it?

[@mat608]

kzbin.info/www/bejne/oqW6ZYWjl62So6c G-Shock

[@fernandobelmudez6419]

Algo simple, pero lindo.

[@Techsas]

Thanks!

[@plac-horizon0043]

does the light works ???

[@cartoonpete407]

I think a small piece of microfibre cloth in that bowl before placing the watch face down would have helped :)

[@DanSaso]

Oh man now we al are going to try this lol

[@Techsas]

I highly encourage that

[@DariusOutdoors]

What happens if you press a button? Oil alarm?

[@nikitaanisov5978]

Nice mod! Nice soundtrack! How the light works with oil?

[@Techsas]

Thanks! Light is as bad as it was.

[@nikitaanisov5978]

@@Techsas Okay. Hope you will show us in your next oil-mod. Just for interest.

[@moto083c]

Aww man. i was hoping you would show how the backlight looks with the oil mod

[@brazilchem]

Does the stopwatch go a bit slower because the viscosity of oil? Can we replace oil with water to avoid this consequence?

[@brazilchem]

@Lewis Friend I swapped oil for ethanol, time goes faster now.

[@AnthonySmith-sc4zs]

Yes!

[@HajoBenzin1]

wait, why isnt the oil leaking when you push one of buttons? or do the buttons get greasy when pushed in several times?

[@Techsas]

It doesn't. I had this question as well, it's one of the reasons I did this mod.

[@HajoBenzin1]

@@Techsas damn thats so cool :)! for a next project you could use oil with some phosphorescence liquid or powder so the watch glows in the dark :D

[@zerousen]

I believe there are o-rings in the button assembly that prevents liquids from getting in (or out).

[@TheAechBomb]

@@zerousen yeah, it's (on my casios) a double O-ring

[@HajoBenzin1]

@Lewis Friend if you push the buttons while under water, it WILL go inside the watch ;) this happend to me twice

[@DigiteAquiONomeDoCanal]

I've read in watchuseek forum if you hydromod a non-diver watch when you press the buttons the oil would leak through the button once they re not sealed. What you guys think? They also said silicon oil isn't not recommended you should go Teflon oil. I have f105w, a700w and a168wemb and I'd like to make them waterproof. Thanks

[@Techsas]

Hola. F91W has rubber seals on the buttons and they are enough, at leas when I tried. Other models should have seals as well if they mention water resistance (WR). Obviously it's not going to be a diving watch, but good it enough for a casual swim

[@5weating_8ullets]

Love this video

[@britneyalice8965]

Would your dye work with 100% Pure fluid Silicone Oil?

[@Techsas]

I'm not sure

[@Manzoril]

Hi, it's nice mode. 👍 How much does it weigh now?

[@Techsas]

Thanks! 22g

[@marvindebot3264]

Yeah, I wouldn't use mineral oil however, mineral oil is slightly conductive, the battery will not last as long. This is best done with silicone oil.

[@mat608]

kzbin.info/www/bejne/oqW6ZYWjl62So6c G-Shock

[@Surpbb-xc8mv]

Now it's water resistant to 6000 m ?

[@manuelribeiro8521]

If we do that to a casio AQ-800 that is analog and digital at the same time will it still work?

[@indrameilanton]

No worries mate, for sure it will work. Only one thing that you need to consider, Casio AQ 800 is a solar powered watch. The oil will reduce the solar panel sensitivity of AQ-800.

[@QMR406]

Can you do a mod of the w-59? It would be awesome!

[@Techsas]

Any ideas what can be changed?

[@QMR406]

@@Techsas I own personally one and its fantastic. You can make a tactical model. Putting a dark nato, paint the watch and also invert the color screen..

[@irfanluriyanto9125]

dude can you custom oil on casio CA53, maybe that's can be great

[@mat608]

kzbin.info/www/bejne/oqW6ZYWjl62So6c G-Shock

[@rexyoda]

Wait, it's not shorting the circuit? Cuz its oil and not water?

[@Techsas]

Yes, oil is not as conducive

[@R0xanneW0lf]

Wouldn’t the oil leak out when u press the buttons? Just a question, it’s been bothering me for a while...

[@Techsas]

I had this question as well but surprisingly it doesn't!

[@sean640]

There's little rubber o-rings on each button. I think that's what is keeping the oil in

[@ttobymac]

This is fucking awesome, subscribed! Gonna have to check out the channell more! Binge watched 4 videos already.

[@mat608]

kzbin.info/www/bejne/oqW6ZYWjl62So6c G-Shock

[@ELEVOPR]

I guess once you have to change the battery, the process starts all over again? Can this be done to Solar Casios?

[@tristan6509]

Yeah but you only need to do that once every 7-10 years...

[@Kiahona]

Techsas, how's the long run with the mineral oil?

[@Techsas]

Have no idea, I gave the watch away.

[@lifeisgood12341]

Probably as long as the watch would last other than changing the battery being a pain.

[@Marco-cl9pb]

@@lifeisgood12341 imagine showing up in a watch seller and asking him to change the battery, I imagine he would be pissed xD

[@Myaccisbanned]

@@Marco-cl9pb He wouldn't care, I remember taking a casio for a battery change and I got it back with the sound not working.

[@Marco-cl9pb]

@@Myaccisbanned was your Casio full with mineral oil?

[@leadsled213]

Colored light filters or gels can be used much easier, i feel.

[@TE_53349]

just done this yesterday with my f91w. crappy display doesnt help with viewing angles as much as it does with an analog watch but still, makes it more water and pressure resistant

[@20epintar]

What kind of dye are you using? Just food coloring?

[@Techsas]

I use dye for oil lamps. Most food coloring will not work, dye has to be oil soluble.

[@testet79]

Wow ❤️❤️❤️

[@thhizon]

Does this mod increase the water resistance of the watch

[@Techsas]

In theory yes

[@kiathanchan1375]

Hello !! Mineral oil filled watch ?? This watch still working ?? Pharmacy grade mineral oil??

[@Techsas]

Hi, yes. Still works I hope.

[@leoisforevercool]

I want to do this, do I have to worry about the sealing rubber ring in the back absorbing the oil and getting thicker over time?

[@leoisforevercool]

@Lewis Friend I already did it sue me

[@leoisforevercool]

@Lewis Friend Keep an eye on your mom

[@deabreu.tattoo]

I wonder if this actually improves the waterproofing, since there's less pressure difference inside and outside the watch when diving

[@TyCo87]

I believe so, Sinn did this with one of their quartz divers

[@spinnanz]

In theory it can now go to ANY depth. No air inside to compress at a high depth means the case can't deform under high pressure.

[@retrohd1_]

@@spinnanz In theory? As long as the plastic casing doesn't break under pressure, it should remain water-proof?

[@spinnanz]

@@retrohd1_ the case can't break under pressure as there is no air inside. Imagine is as if the case was full of sand.

[@EdouardTavinor]

​@@spinnanz i imagine there are some capacitors and other electronic components that might break at enormously high pressures, but apart from that i agree with you 100 % :)

[@dimpfelmoser]

I hope there is never a leak. Hope the seal works for many years. 😉

[@sterkriger2572]

Well mineral oil will eat out the rubber gaskets in about a couple of months.

[@waris3732]

@@sterkriger2572 I thought mineral oil helps rubbers from drying out

[@tydshiin5783]

@@waris3732 I think its more likely for the oils that are already in the gaskets are gonna get dissolved by the mineral oil, and then it'll start to slowly leak

[@dansw0rkshop]

Mineral oil does eat rubber generally, but how fast may depend on the compound. There may be some oil-resistant rubber compounds.

[@ranjankc121]

What happens when you open it again for battery change? Will there be oil inside the watch?

[@Techsas]

Yes. Because I put oil inside the watch.

[@robertguy23]

lmao

[@hehehexpresso]

@@robertguy23 maybe he thought that the oil inside will vaporize overtime

[@metaldog7128]

Why not just use a colour filter between the module and the case screen, they come in many colours and you can change it when ever you want.

[@eclu123]

Exaxtly

[@thomasmoran1211]

Wouldn't make it water proof

[@metaldog7128]

@@thomasmoran1211 it’s already waterproof from the factory

[@thomasmoran1211]

@@metaldog7128 it's not. It's water resistant. I killed mine surfing today. That's why I'm here. Someone has filled one with olive oil (similar to this) and kept at 900m below an oil prospecting rig for 3 days.

[@metaldog7128]

@@thomasmoran1211 I’ve never had any problems with mine, but I’ve never had it in the sea for longer a couple of seconds why doing stuff on the boat, but surfing it’s taking a beating for sure 👍 maybe go for a G Shock frogman .

[@1Raphael]

Awesome... now its pizza time🍕🍕

[@Techsas]

haha thanks!

[@suegere]

is silicon oil save?

[@Techsas]

Yes. Probably even better

[@rudrakshprasad3014]

How can I get started with watch modding ????

[@mat608]

kzbin.info/www/bejne/oqW6ZYWjl62So6c G-Shock....

[@alimpurnomosidi3261]

Can I use cooking oil instead of mineral oil for this?

[@Techsas]

Probably. I don’t know how will that will affect your watch in the long run.

[@Lunas2525]

Lots of reasons not to. Cooking oils can be more reactive thus cause corrosion or they can be conductive mineral oil is particularly reactive with abs and pvc both of which this watch contains quite a bit of it will make it brittle and break down the plastics.

[@sped6954]

Not only that, but have you ever smelled cooking oil after it turns? I don't how to describe it, but it is one of the foul stenches around. I also don't know how long it takes, but it's definitely inside the two year mark.

[@CoreyBrass]

I wish he you did red to match the WR.

[@mat608]

kzbin.info/www/bejne/oqW6ZYWjl62So6c G-Shock

[@showjaymayhem]

Won't oild damage rubber sealing?? looks cool though

[@unzulaessig]

mineral oil is harmless

[@showjaymayhem]

@@unzulaessig thank you! .I saw silicone grease melting the rubber gascket. so i was wondering if oil does it too.

[@unzulaessig]

Now she float?

[@techtinkerin]

I think you're inhaling oil fumes lmao😂

[@Shadow77999]

Nice music

[@pepebel2809]

With hydro mod does it ressit water better?

[@Techsas]

Yes. Someone did an experiment bit.ly/2UmSt1I Surviver at almost 1km depth for 3 days

[@pepebel2809]

@@Techsas awesome👍

[@Marco-cl9pb]

I've seen computer aquariums (in mineral oil) but never a watch

[@radov22]

i do with CASIO MDV-107 :)) only luminiscence is bad... watch is great i use blue oil is perfect piano black shine vs blue oooomg i love it :)

[@panosvrionis8548]

I did that in a a158 with yellow tint using manual transmission oil 75w something.. It looks like old lcd screen

[@dysastro5362]

I wanna do this with my watch (same one) and I've already got transfluid, got any pics of how it turned out?

[@panosvrionis8548]

@@dysastro5362 Send me a link please. And give me time because im at work until 22:00

[@tostada_gaming_93]

Doesnt the oil damages the battery? Why are you filling it with oil?

[@Techsas]

Oil is non conductive. Increased water resistance.

[@tostada_gaming_93]

@@Techsas thanks for the response

[@alisterquinny4767]

I don't understand what happens if you put oil in it

[@garciasanchezrafaelalejand6809]

Se puede remplazar la batería no?

[@Techsas]

Yes. 10 years later you might as well change the oil.

[@ranjankc121]

Is the remaining oil reused or it is wasted..

[@Techsas]

Can be reused

[@ranjankc121]

@@Techsas thank you so much...

[@NathanHassall]

So here is what they don't tell you about doing this. Firstly, you'll lose the beep..the alarm becomes barely audible after this. Second your buttons are gonna get mushy and sticky and sometimes even dribble a tiny amount of oil on your finger when you press the buttons (the oil on your fingers gets transferred to your clothes) all this so you can go deep diving with your casio f91 that you will never do.

[@neilbegley8886]

In pretty sure the watch is only waterproof when not pushing the buttons . Every time you push them it opens and a tiny bit of oil will leak

[@HaxR3]

How is this holding up 3 months later? I'm thinking of doing this with some fluoro resin dye mixed into the oil and a UV led replacement.

[@Techsas]

I don't know. I gave it away...

[@felipeaguirre2898]

That's so cool! Doesn't the oil damage the internal components?

[@gazehound]

Nope. Mineral oil isn't corrosive to the traces or components.

[@Lunas2525]

Long term effects are this will corrode and seep into the plastic

[@Techsas]

Very cool

[@TheAechBomb]

yeah, mineral oil isn't great on plastics, see the mineral oil submerged PC trend fron like 2012-2016 I would love to see a follow-up on this watch though, if you still have it

[@effortlessly]

Would silicon oil work better?

[@alejandroolivas6703]

Baby oil would work?

[@Techsas]

It should work but I cannot guarantee if it's safe long term

[@lhl2500]

Couldn't the same effect have been achieved with a coloured film over the lcd?

[@Techsas]

Yes I've done some videos with the film

[@diomaiaal]

Coloured film is for kids. Coloured oil filled watch is for men

[@lhl2500]

@@diomaiaal Until you need to change the battery.

[@34darijusas]

@@lhl2500 first time giving your digital watch an oil change?

[@Lunas2525]

This also increases water resistance to crush depth

[@Ferberuz]

Something for the f-105??

[@Techsas]

have any ideas?

[@Ferberuz]

@@Techsas nothing, you are the genius

[@RiderOftheNorth1968]

And now: Put it in the car a warm summerday!

[@wikuserasmus1]

Enjoy the battery change

[@John-mf6ky]

Cool! I was going to use some polarizing film on my f217h. I might have to try this instead. I was thinking about oil filling it anyways.

[@zilvinasbaskys7194]

I now sell different color lcds on my etsy so no need to struggle with film or dye.

[@VincentOak]

why not both?

[@daras-]

Bad news, mineral oil consume plastic. U have to use silicone oil.

[@imagebboy]

Just did some oil modding 2 days ago... didn't turn out so great, I really need to use a syringe or something to get more air out. I really wanted it to work on my white face timex Waterbury indiglo. I think it would look killer if I could pull it off.

[@Techsas]

As you can see its doable without a syringe, just need some patience. Squirting the oil out would just create more air bubbles.

[@NK-ng2vg]

@Joseph Does indiglo and date functions still work as should with oil inside the case?

[@imagebboy]

@@NK-ng2vg It did, yes, but I was unable to test it long term. I had a friend that wanted to buy it, so I dried it out for him and he has it now. It still works.

[@user-zn6de2kk4x]

Genianusli

[@Techsas]

Thanks!

[@choyrizo]

La música es maravillosa! Gracias por todo!

[@antonioallcoelho]

Why? i dont get it?

[@Techsas]

More water resistant