tylerd1994 Posted September 1, 2008 Report Share Posted September 1, 2008 i bought this rtv silicone sealant stuff at walmart and squeezed it all into a small plastic box. Then i put a worm in it. I did exactly what you do for plaster or liquied rtv. I did all of that and the mold is just about to be 24 hours cured and 11 oclok tonight. Iv'e noticed it is real soft and its still not cured in the middle of the mold. Since its a sealant i think it blocked off air to let the rest cure. Will it eventually after a couple days cure? Or should i do something to it like drill a couple smalls holes in the bottom. If i need to do something what should I do? THANKS!! Quote Link to comment Share on other sites More sharing options...
Ed Brabant Posted September 1, 2008 Report Share Posted September 1, 2008 I am no expert but the RTV Room Temperature Vulcanaziton that you are using is differnt from the mold RTV. The mold RTV is a part A and part B mixture. One is a catyalist that helps to cure the RTV. The sealant you bought may never quite do what you want it to. I am sure one of the experts will chime in and tell you exactly what will happen. Quote Link to comment Share on other sites More sharing options...
longhorn Posted September 1, 2008 Report Share Posted September 1, 2008 I'd just wait...it will eventually harden. Quote Link to comment Share on other sites More sharing options...
bassn1 Posted September 1, 2008 Report Share Posted September 1, 2008 If you add a tablespoon or two of water to the mix it will harden all the way in half the time. There was a tutorial a while back, I think it was under "clamshell mold" or something like that. Quote Link to comment Share on other sites More sharing options...
redg8r Posted September 1, 2008 Report Share Posted September 1, 2008 http://www.tackleunderground.com/forum/soft-plastics/10753-rtv-silicone-alternatives.html Don't forget the 2nd page. Good luck Quote Link to comment Share on other sites More sharing options...
jigmeister Posted September 5, 2008 Report Share Posted September 5, 2008 silicone sealant is a different animal than the mold-making type . It actually needs water (moisture) to cure . Another troubling charactoristic is that it wants to stick to everything (good for a sealant but bad for mold making) If you add glycering oil and apple barrel paint to the sealant type silicone and stir it all together good it will dry and not stick to anything . I think it was 2-3 drops of each per ounce of silicone . I tried it just playing around and it seems to work...........Good luck ,Jigmeister Quote Link to comment Share on other sites More sharing options...
redg8r Posted September 5, 2008 Report Share Posted September 5, 2008 silicone sealant is a different animal than the mold-making type .It actually needs water (moisture) to cure . Another troubling charactoristic is that it wants to stick to everything (good for a sealant but bad for mold making) If you add glycering oil and apple barrel paint to the sealant type silicone and stir it all together good it will dry and not stick to anything . I think it was 2-3 drops of each per ounce of silicone . I tried it just playing around and it seems to work...........Good luck ,Jigmeister Yep, adding water to the silicone sealant is a critical step to induce a full cure, as noted in the tutorial. This has nothing to do with RTV silicone, as my experience has shown the same problem, you get a skin cure about a 1/4" deep then the interior never cures. I'm not sure why automotive RTV is necessary, as typical catalyzed RTV or silicone caulk will endure the heat of plastisol. One spot I disagree is using "paint" (water based) to induce curing, because my experience is that the pigments in the paint will transfer onto the plastisol, which is why I recommended water. hope it helps. Quote Link to comment Share on other sites More sharing options...
