basskat Posted February 20, 2013 Report Share Posted February 20, 2013 It's hard to say, it is for my smaller molds. Be careful they crumble pretty easy when still wet. Quote Link to comment Share on other sites More sharing options...
MuskieBait Posted February 20, 2013 Author Report Share Posted February 20, 2013 I let it go 90 min...came out of the box nicely. I had more run under the bait than last time but that was my fault and I know what i did. It was nothing a few extra min with the x-acto could not fix. Quote Link to comment Share on other sites More sharing options...
wchilton Posted February 20, 2013 Report Share Posted February 20, 2013 Sounds like you're getting a process that works for you figured out. For future reference, since you are using a lot of POP for those big molds, check your yellow pages for a local "plaster supply" house and give them a call. They may have either a "molding plaster" or a "casting plaster" that is near or identical to POP. I think I paid about $20 for a 100 lb bag. There is also a category of materials called "gypsum cements" that are similar to the plasters but set up much harder. I've tried one called "UltraCal 30" that sets up rock hard but I didn't like the way it reproduces fine detail. If you do find you need something that sets up harder, you might look into those. There's info about various types of plasters and gypsum cements at www.plaster.com Quote Link to comment Share on other sites More sharing options...
mark poulson Posted February 20, 2013 Report Share Posted February 20, 2013 The reason older POP mixes and sets up weird is that it is constantly pulling moisture out of the air when it's stored, like activated charcoal filters, so it's important to store it in a sealed container. Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted February 20, 2013 Report Share Posted February 20, 2013 I guess you could roast it, but was too impatient to try that. In theory, it would all convert back to the original formula. Dave Quote Link to comment Share on other sites More sharing options...
MuskieBait Posted February 21, 2013 Author Report Share Posted February 21, 2013 Just put epoxy on the first mold last night. It is nice and shiny and smooth this morning. I used devcon 30min 2-ton epoxy...Was that the right 30min epoxy to use? Quote Link to comment Share on other sites More sharing options...
