How to Cast Urethane Rubber in a Silicone Mold

How to prepare, pour, and finish urethane rubber in a silicone mold. I use Smooth-On urethane rubber to make several pieces of jewelry including a two-color cameo.

[mickcoomer]

If you are concerned about the second layer of rubber disturbing the first you could place a stirring stick on top of the mould and pour onto that. This means that the drop to the surface is only a short distance.

[cryalot]

I wasn't prepared for that Star Trek reference, I almost choked on my cereal xD. But thank you so much for this video, it was very helpful! Earned a sub right away.

[mathkor]

how much does urethane rubber differentiate when it comes to casting ?

[meeganmccaffrey]

Any suggestions on how to make something bigger? I want to make a solid hemisphere, 8" diameter, able to hold about 200lbs. Any ideas? Concrete was too crumbly after lots of use, but otherwise not too bad.

[LoreCraft]

Hey there man,
Appreciate you posting this up. I presume you can do the reverse here with no problems (i.e. urethane rubber mould and cast silicone, etc). I just asked a general question about it on a forum and someone there is saying the silicone would suffer cure inhibition if casting it in a urethane rubber... can you weigh in? If you're casting urethane in silicone, surely you can cast silicone in urethan rubber, aye? Thanks for posting!

[swagvids]

I was wondering if you can help me. So I need urethane make sure to make my Spider-Man webs for my suit. I’ll be putting my urethane into a mold but im not sure which urethane would be the best. What’s prob a good mixture to make flexible webs from a mold and to be glued onto a suit. Any extra information is appreciated

[andydiaz]

Hey dude, thanks for this video. I'm trying to make my own skateboard wheels. Do you have any tips? I'd like to make hard wheels that will slide well.. how can I find rubber with harder durometers?.. Thanks!...

Also.. how do you cure the rubber?

[hiba]

Great video! is there any paint that sticks well with urethane? wanted to paint over after the cure.

[MrBertWillard]

I'm struggling with a poly project...or is it a silicone project? I want to make my own thin poly sheets that are just flexible enough to be re-heated later, supplemented with more poly, etc. Same stuff they use in thin skin hair pieces...but don't know the formula. Trying to make skins for cosplay, removable / realistic tattoos, and pieces with realistic hair imbeds like they do on movie sets. Any suggestions? Thanks Kai!!!!

[heliogomesmagalhaes]

Hi, can you please tell us which release agent you used? Is it the same you use to avoid silicone rubber moulds to stick to the bottom and sides of the mould container (box in which you made the mould)?

[barlowetube]

Is the urethane flexible or completely rigid?

[Fatamus]

Looking to make a rubber tip on a float valve in an old obsolete equipment carburetor. it is a small part but it needs to be gas and oil resistant, do you have any suggestions on molding a Butyl rubber compound?

[karolinakiwicreations]

"Drug Dealer AF" warning LOL..dude..i call my scale my drug scale all the time in my FB live videos LOL...so glad i am not the only one!

[Cabledeluz]

I need to mold rubber polyurethane, not liquid. So I will be heating up the polyurethane and pouring it in a mold. Will the silicone hold the heated polyurethane?! Do you know what the heating temperature is before the mold is ruined or what types of mold I should use?

[Billan]

Seriously, thank you for making this video. I've been unsure about whether you can actually cast urethane rubber in silicone molds or if the mold has to be solid, so thank you! On the other hand, there really is no reason to use a flexible mold material such as silicone when casting urethane, correct? Since the urethane is flexible in itself. Do you think I could get good results pouring the urethane into a plaster mold? Again, thank you!

[hunterthomas]

how flexible is this rubber? I am made a lot of molds and poured resin, but never rubber. Was wanting to make a more flexible/durable action figure than what resin offers

[superpayaseria]

Hey dude u look perfect for the robotic humanoid project I'm working on. Like ur enjoyment toward getting dirty into all the tuff stuff. Would u be up for discussion, do u have contact info? Either way loved the vid dude, that was great!!

[jaybyrd]

Planning on making urethane body pieces for cosplay...does this method work depending on the firmness of the urethane? Cure times? Demold times? do you recommedn slush casting?...so many questions :)

[fakejake]

Is there a clear and flexible urethane out there??

[DingleDut]

Did you use arcylic paint for the color? What did you use?