overkill Posted February 27, 2005 Report Share Posted February 27, 2005 When you guys make a polyester mold of a model coated in epoxy, do you use a mold release or not? I am making a huge swimbait. I made the model from sculpey and coated it in Etex. Quote Link to comment Share on other sites More sharing options...
jigmeister Posted February 27, 2005 Report Share Posted February 27, 2005 polyester molds shrink slightly when setting up are very rigid once dry . If your original/model being copied is a hard material you will have a heck of a time prying it out of the cavity and will most likely destroy the master and or the new mold . 2 part Silicone molding material works well with hard material prototypes . Quote Link to comment Share on other sites More sharing options...
dtrs5kprs Posted February 27, 2005 Report Share Posted February 27, 2005 ditto...RTV would be the way to go for the original, then use resin to duplicate the mold. Quote Link to comment Share on other sites More sharing options...
