Starship Modeler Discussion Forums

I tried the Durham water putty and the same thing happened. My mold material bonded with the putty through the Killz seal.

The plaster was plaster of paris.

What is a good way to seal plaster for use in molds?

I tried Killz but that failed. Not only did it not seal the plaster, it made it softer and brittle.

I tried vaselin thinned down with alcohol, but that also failed.

Suggestions?