cavx
Master Member
It can be done with a release agent. A spray on will be best.
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Casting silicone with a silicone mold
- Thread starter juno
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cavx
Master Member
If you use an additive silicone, curing will not be a problem.
If you are wanting to use a cheap caulking silicone, stick it in the fridge. Air curing is actually condensation curing, so get it nice and cold, then leave on the bench. Or add acetone to the mix and as that evaporates, it make condensation and will cure the silicone in about 2 hours.
Your best results will come from using a good quality additive silicone.
That's a pretty good idea, I've been using contractor silicone, as it *usually* mixes well with paint. As an example if I mix 2 parts silicone and 1 part naptha or acetone ( not sure which would be better) then fill a drinking straw, it should dry/cure after a bit in the fridge? Also, should I refrigerate before or after mixing? Sorry for all the questions, this is very helpful thanks!
cavx
Master Member
Because to get solid rubber parts, you need to degas and I think this was mentioned earler.
Also, if you are using caulking silicone, it does not flow as it is already in a gel state. The stuff we make molds from are liquids that gel up and then set into rubber. But you are also looking at $40+ per KG pending where you buy it from.
Ooph, well I guess it's worth it for the right project, I've just been trying to do it on a budget. I did find out however, that to fix the problem I just mix up more of the same and pretty much coat them in it while wetting my fingers and kind of giving it a top layer to fill in holes and smooth it out, similar to caulking a bathtub. I really appreciate the time you put in to answering my questions and helping me out, hopefully I can do the same some day
cavx
Master Member
I get where you are coming from, but there comes a time when you can spend as much money on trying to achieve a result and having to re-do it due to fails as you can just buying the real stuff.
I want to cast silicone into a small but quite deep silicone mold, so I won't be able to brush the insides. I tried to use ease release 205 by pouring it in and pouring it back out again, but it seems to have affected the cast and made it tacky, and you can also smell the release agent on it which makes me wonder if it might be bad for longer skin contact. I was thinking about trying to pour spray wax into the mold instead. Would that be possible or do you have to spray it on so it won't be too thick? If spray wax is an option, what kind of wax should I use? Would silicone-free carnauba sprayvax that you use for cars work?
Hope the post wasn't too long and ranty.
Thanks in advance!
//Phontas
Hope the post wasn't too long and ranty.
Thanks in advance!
//Phontas
Smooth-On makes a skin safe silicone, if that's what you are concerned about.
