bass ackwards Posted July 19, 2004 Report Share Posted July 19, 2004 when using plaster to pour a two part mold what should I use to keep the first pour from sticking to the second pour? what should I use when using liquid resin,(from local auto parts store)? : Quote Link to comment Share on other sites More sharing options...
vishezfish Posted July 19, 2004 Report Share Posted July 19, 2004 I use vaseline to separate my plaster 2 part molds, for the resin I have no idea.... I don't think you can make a 2 part mold out of thr resin.... I think I asked on that one.... I'm going to try and use Durhams water putty, senko sam uses it so it must work!!!! Quote Link to comment Share on other sites More sharing options...
jigmeister Posted July 24, 2004 Report Share Posted July 24, 2004 vaseline works great for 2 part plaster molds and may work for resin as well ? I just made a 2 part resin mold and tried a silicone release agent a co-worker suggested . You brush it on and it dries but leaves a film . When I tried to separate the two resin halves they appeared to be fused solid and I was thinking "great after all that work @#$%!" I kept prying the two halves and slowly they separated giving me a perfect 2 part resin mold . I think next time I'll try multiple coats of the release agent and see if that helps Quote Link to comment Share on other sites More sharing options...
Mojo Posted July 24, 2004 Report Share Posted July 24, 2004 Meister, what is the brand name of the silicone release agent? I want to use resin for a 2 part mold as well, this stuff sounds like it'll work. vaseline works great for 2 part plaster molds and may work for resin as well ? I just made a 2 part resin mold and tried a silicone release agent a co-worker suggested . You brush it on and it dries but leaves a film . When I tried to separate the two resin halves they appeared to be fused solid and I was thinking "great after all that work @#$%!" I kept prying the two halves and slowly they separated giving me a perfect 2 part resin mold . I think next time I'll try multiple coats of the release agent and see if that helps Quote Link to comment Share on other sites More sharing options...
jigmeister Posted July 25, 2004 Report Share Posted July 25, 2004 Its made by "Devcon" and you can see it at their website. Tap plastics also sells something similar so you can check them out also . Quote Link to comment Share on other sites More sharing options...
Fish_N_Fool Posted July 27, 2004 Report Share Posted July 27, 2004 Hey guys, 2 part resin molds do not work because they warp from the heat of the plastic and you end up with a 1/4" gap in the middle. The hotter the get the more they warp. They work fine for 1 piece molds but not at all for 2 piece. Durhams is still the best stuff I have found for 2 piece molds. Quote Link to comment Share on other sites More sharing options...
jigmeister Posted July 28, 2004 Report Share Posted July 28, 2004 I have made two part molds from both Durhams and resin . The curing temp on the resin is a direct result of how much hardener you add. I think I went with something like 10 drops hardener per oz . of resin. This is also with TAP casting resin. the first molds I tried with polyester fiberglass resin got way too hot and cracked with the same 10 drop formula . The finished 2 part resin molds will soften up some and warp if they're allowed to heat up in the sun . I keep them clamped together when not being used. You can try heating the halves up in the sun , clamping them together until flush and then cooling and it might cure the warping(1/4" gap) between the two halves. Quote Link to comment Share on other sites More sharing options...
the_hide Posted July 29, 2004 Report Share Posted July 29, 2004 I use a Canola Oil Spray as my release agent on plaster molds. Spray it and let it sink in for 10 or so minutes, no marks and almost no bubbles in the plaster. The plaster absorbs the oil and gives the mold a softer feel until it dries out overnight. Perfect separation, sometimes to perfect I've dropped the lower half of a mold onto the patio more than once. Quote Link to comment Share on other sites More sharing options...
mgodliman Posted July 29, 2004 Report Share Posted July 29, 2004 I've not used any release agent for my plaster mould,though I did originaly spray the inside with the kind of paint called BBQ paint heat resistent I guess,with mixed results.Some of the paint came off onto the lure this easily easily removed with meths also the surface of the lure is quite matt and I find going over it briskly and carefully with a blow lamp gives it a nice shine,I'm sure the fish don't care! My whole method is probably crude looking to you guys so far I've only made a kind of Mag Dawg of my own and use melt down scraps in a saucepan resulting in some dull strange colours but the action is great. There is nowhere here in in England or the rest of Europe apparently to buy raw material,(soft plastic not plaster !!)so importing such bulky stuff from the US is too expensive. Quote Link to comment Share on other sites More sharing options...
