Fiberglass mother over silicone mold?

[bpwmd]

Is there any problem laying a fiberglass mother mold over a silicone inner (not sure the correct name for that. Fill me in if you know) mold. Or anything you have to do before applying it? I'm using rebound 25.


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[Gattaca]

You can use mold release spray or even Vaseline or soapy water (do a small test first just in case).

 

[IEDBOUNTYHUNTER]

You can lay fiberglass over silicone. no release needed. do it all the time. I also use Ultra cal 30. super cheap and works just as good. and the added benefit of the ultra cal is it doesnt stink. and only clean up is water.

Plus a 100 pound bag of ultra cal is 25 bucks and lasts for ever. im still using my bag going on two years.

 

[propninja]

I generally do it the other way around, but yes what you suggest can work
I usually do clay over the part then fiberglass over that. when the fiberglass hardens I remove the fiberglass shell, scoop out the clay, replace the shell and pour rubber onto a hole cut for that purpose. (reader's digest version)

 

[bpwmd]

Awesome. Hope it works lol I glassed it a little bit ago. Come back home and see how it is


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[bpwmd]

Hey guys thanks for the help so I have two questions. First is I feel silly calling it an inner mold. What the coffer term for the silicone part if the mold. Second I had a little problem. It's a front half mask so I didn't think I needed to do a two piece mother mold. Eeeeeeee I was wrong. So now I have a good mother but need to add some flanges to it for claiming/bolting it together as I had to cut it in half vertically to free the mask. So the question is will fiberglass stick unerringly to fully cured fiberglass for the purpose of building a flange on it instead of building a whole new one?


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[IEDBOUNTYHUNTER]

Yes, you need a release fiberglass will stick to fiberglass. you can use a wax release or a thin coat of Vaseline.

 

[bpwmd]

I'm actually using tin foil for the parting line I just wanted to make sure it would adhere to the parts it is suppose to enough to be strong lol. Thanks


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[swgeek]

If you don't want the fiberglass to stick to fiberglass, then yes you will need some kind of parting film/release. I would think aluminum foil, as you said, should work. If you are trying to get it to stick, just make sure you sand the previously cured fiberglass and clean it with acetone.

 

[zorg]

Its the only way i make my molds, i use vaseline as a barrier between the fiberglass walls, sometimes with tin foil as well.