Boskabouter Posted December 9, 2007 Report Share Posted December 9, 2007 Since I ruined my first plaster mold I want to do things better this time. I made a new hardwood model and covered it with Envirotex lite. Bought a different brand of plaster (ceramic/porcelain type) and I'm ready to make the mold now. Should I still cover the model with some release agent to avoid sticking to the plaster? I've been doing my homework and read some older topics on this subject. I know vaseline is used but I was wondering how much does a release agent affect the model's cavity after taking the model out of the plaster? If it does, then works a sealant for the cavity as a cure? What about a silicone spray or WD40 as a release agent? Quote Link to comment Share on other sites More sharing options...
nova Posted December 9, 2007 Report Share Posted December 9, 2007 Are you making a one part or two part mold? Also, what shape is your master? If the master has curved edges it won't matter how much you "grease" the master, it won't come out without ruining the mold. www.novalures.com Quote Link to comment Share on other sites More sharing options...
longhorn Posted December 9, 2007 Report Share Posted December 9, 2007 If the profile of the carving will trap it in the plaster you might try RTV for your master mold so it will release. Hard to say without knowing the shape of the your carving...or you could try to carve another out of wax so you'll be able to use plaster. Quote Link to comment Share on other sites More sharing options...
Boskabouter Posted December 9, 2007 Author Report Share Posted December 9, 2007 Thanx for answering guys and trying to help me out. The model I carved is a pintail shad. The sides of the body are curved down to the belly. So the bottom of the belly is smaller then the top just like most regular shadtypes. Instead of a swimtail this one has a pintail. The mold will be a one part. Planning to dip the model in the surface of the plaster. I dropped my camera in my livebait barrel, so I'm not able to upload pictures at this stage. What I'm afraid of is that if I cover the master with vaseline the cavity will differ from the actual model due to fact that I might not be able to spread the vaseline symmetric over the model. There might be spots where the vaseline is thicker then on other spots. Does this actually affect the cavity or am I having nightmares for nope? Quote Link to comment Share on other sites More sharing options...
nova Posted December 9, 2007 Report Share Posted December 9, 2007 I never cover my masters with a release. Just make sure you seal the master well and you'll be fine. www.novalures.com Quote Link to comment Share on other sites More sharing options...
Boskabouter Posted December 9, 2007 Author Report Share Posted December 9, 2007 I guess I have sealed the master good enough using ET lite. I'm just going to give it try tomorrow and see what happens along the way. It's trial and error either way. Hopefully my camera will be up and running again after it has dried so I can be back with some pics. Thanks once again for the input. Quote Link to comment Share on other sites More sharing options...
