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EG60 Epoxy Tooling GelCoat/EMP60 Epoxy Mould Making Paste in a CS25 Silicone mould. Doable?

http://www.talkcomposites.com/Topic29337.aspx

By TURK - 9/10/2018 7:41:14 AM

Hi all,

I have a mould that I made with CS25 Silicone rubber of a headlight part,  I'm hoping I can apply a coat or two by brush of EG60 Epoxy Tooling GelCoat in the mould,  and then back it with EMP60 Epoxy Mould Making Paste to a thickness of 2cm,  to harden the structure.  Have any of you tried this?  Do you think this will work?  As the CS25 Silicone is quite pliable and Silicone ( as silicone doesn't stick to anything! ),  I should on theory be able to de-mould my mould.  But would there be some sort of reaction between the two products?

I just need a temporary prototype mould for testing purposes.  This is the mould I'm hoping to apply the EG60 in,  and then the EMP60 mould paste  >>



Usually I would use 'Vac Cast Epoxy Casting resin', but I haven't got any of it in stock right now ..........  but I do have the EP60 and the mould paste.
Besides,  I think that this would be quite an interesting way of making vacuum forming plugs,  as the plugs themselves would be hollow.  Which is great for vacuum forming as you need to drill air holes in your moulds.  A solid block of Vac Cast resin is quite difficult to machine holes in!


TURK
T4 Concepts
By TURK - 9/11/2018 1:40:36 PM

 
Warren (Staff) - 9/10/2018 4:11:13 PM
Its the lack of surface tension that causes the issue so soap wont help.  You want surface tension to help the gel stay in place.

You're absolutely right Warren! ................  I got that wrong didn't I mate!  Blush
I should be using 'Talc' in that case ( as in talcing powder).  But what effect will the talc have on the Gel Coat!?

Mmmmmmmmmmm ...................  I may just go with chasing the fish-eyes around!


TURK
T4 Concepts