sealing a closed mould?

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sealing a closed mould?

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Fasta	Fasta posted 9 Years Ago HOT Topic Details
Group: Forum Members Posts: 468, Visits: 3.5K	I am about to bladder mould a part within closed moulds and was thinking that this may try push a bunch of resin out through the clamped flanges and just be messy?? Hopefully not? The flanges are just flat and have some location bumps. Does anyone have a clever temp trick for sealing my flanges? It's a wet layup epoxy job. Maybe just a bead of epoxy glue in within the flange would be thick enough to stop any flow? Or maybe an automotive gasket goo? Fastacraft Facebook page
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Hanaldo	Hanaldo posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	I use automotive silicone gasket maker to seal any split moulds that I am infusing, not totally sure if it would work for your application but I dont see why not. Even if you just ran a bead around the outside of the join on the flanges to prevent excess epoxy from making a mess? Actually the one potential issue I can see is letting the silicone cure. I always apply the silicone and bolt my mould together 24 hours before infusing to prevent any reaction with the epoxy. That wouldnt be possible in your case...
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Fasta	Fasta posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 468, Visits: 3.5K	The moulds are prepped with Frekote 700 which is a silicone base system. The silicone sealant may bond the moulds together. I have had a silicone issue in the past where I cast a silicone part in a frekote mould and it stuck permanent. The flanges are also waxed but Id still rather not use silicone. I might try some small tests with PVA glue or clag craft glue? Fastacraft Facebook page Edited 9 Years Ago by Fasta
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Hanaldo	Hanaldo posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	The blue automotive RTV silicone works fine with Frekote, its what I use myself. Stay away from the silicone sealants that you get in a hardware for sealing gutters and showers etc, they will bond to the mould.
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Fasta	Fasta posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 468, Visits: 3.5K	Ok I'll get some and do a small test on the flange before I commit. I have some red RTV stuff on hand. Same thing? What ever I use it needs to be slow enough setting so I can get around the 2.5m of flange and close the moulds but then set enough or just be stiff enough to block the flow of resin once the pressure comes. Fastacraft Facebook page Edited 9 Years Ago by Fasta
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