Anyone used clear-cast resin with silicone?

Birdie

Master Member
RPF PREMIUM MEMBER
All the clear-cast resin leaflets state that it shouldn't be used with a silicone mold. I've tried using clay moulds, but it really isn't satisfactory for what I'm trying to do. Is there any way of getting a decent release using polyester clear-cast with silicone?
 

exoray

Master Member
Originally posted by Birdie@Apr 2 2006, 11:46 AM
All the clear-cast resin leaflets state that it shouldn't be used with a silicone mold. I've tried using clay moulds, but it really isn't satisfactory for what I'm trying to do. Is there any way of getting a decent release using polyester clear-cast with silicone?
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As for clear casting in silicone, not a problem with the right resin...

But, as for polyester clear in silicone, yep the surface gets funny...

I, 100% stand behind Smooth on clear urethane resins, worth every penny... Next in line would be Alumilite clear urethane... Polyester clear resins just don't cut it IMO when using a mold...
 

hydin

Sr Member
RPF PREMIUM MEMBER
I used silicone for about 90% of my molds for my stuff, ranging from my "Blue Rose" to bullets to rings.

all polyester (and now epoxy) resin. only thing i can say is mold release is a good thing.

chris
 

zorg

Master Member
RPF PREMIUM MEMBER
i use it no problem with my 3po eyes, its urethane (sp) resin though, poyeter shoud be ok too


z
 

Blad

Sr Member
Are you talking about damage to the silicone mould? Or the tackiness you get with clear-cast polyester?

Spray mould release works fine with me - you really need to leave the polyester in the mould for as long as possible, hours really to reduce tackiness.

I've also mixed a small amount of styrene with the clear-cast resin, which can give it a very slight milky look - but after polishing thsi seems to disappear. Huge benefit is almost zero tackiness and you can release from the mould after 30 mins no problem.

You'll probably only get 25-30 pulls out of the mould before you need to look at relining it. I know you are supposed to be able to 'cook' silicone moulds to redistribute the oils (or something) - doesn't work for me. Just get brown stained moulds that smell like they've been cooked. Maybe the ancient Baby-Belling had something toi do with it.
 
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