I just got off the phone with the folks at Alumalite. We got onto the subject of painting resin castings. And the lady there asked what I was currently using as a mold release. She then says that since I am painting them anyway the very best mold release to use when painting is . . .well. . .paint. She says any old can of Krylon will do as long as it is fast drying so that you can keep production up. She said just paint the inside of the mold like you would any release and let it dry completely and then pour. The resin adheres to the paint and makes a pretty permanent bond. She did caution away from rustoleum as it has been know to work against the resin. She said Krylon brand works the best. She said then top coats adhere very well tot he part making a very durable finish.
Has anyone tried this? One subject that has come up with the bunks that I want to make are the desire to have the base part be a rust color so that you can let it show through for a weathered effect. The resin can be dyed but not with much precision. If a person finds their favorite krylon color and uses it as the base I think this would add a lot of flexibility to the casting process.