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You’ve made the perfect mold and have just poured Smooth-Cast liquid plastic into the mold to make a reproduction. The plastic cures and you demold the piece to reveal a casting that looks exactly like the original. Your next step is to paint the casting for outdoor display, but the paint beads up on the casting surface and won’t stick.

Urethane plastics can be hard to paint, and there are a number of variables that can affect the outcome. Using a release agent to release the casting from the mold, for example, makes painting a casting almost impossible. Not using a release agent is not an option when your mold is made of urethane rubber, and using a silicone rubber without release agent limits the production life of the mold by 1/2 if you are casting urethane resin.

There are a couple of ways to get the benefits of using a release agent and still have a casting ready for painting following demold. Powder coating the mold with ATH or talc following the application of a release agent is one way.

Click HERE to learn more about the powder coating technique . . .
 

The Best Method Incorporates The Use Of A Spray Primer Applied Directly To The Mold Cavity Prior To Casting.   Here’s How . . .

1) Mold release is sprayed into the mold cavity.	2) Auto body primer is then sprayed into mold cavity.		3) Resin is cast or sprayed behind the primer.
4) Casting comes out of the mold ready to paint.		5) Spray paint then adheres to casting surface without a problem.