I want to convert my molds to a semi-permanent mold release. Do I need to strip them first to do this?

If you are evaluating any mold release, we suggest that you totally strip a test mold and prepare it according to the manufacturer’s instructions. This is the only way you can gauge performance and understand the specific application process. When testing any mold release, we always suggest that you select a test mold that is representative of your production, and one that is expendable in the event of a mishap occurring while testing. Always perform a tape test in several areas of the mold to assure that it is clean (tape should adhere well). Similarly, always perform a tape test on several areas of the mold after applying sealer and release (tape should release easier than on a clean surface).

Seasoned Test Mold Previously Prepared with Wax
This includes any kind of liquid wax, paste wax and waxed based sealers. Remove all foreign matter from the mold surface with a high quality mold cleaner and a cotton cloth. We do not recommend applying a semi-permanent directly over waxes, as this will compromise the bond of the semi-permanent mold release to the mold surface.

Seasoned Test Mold Previously Prepared with a Semi-Permanent Release
All semi-permanent mold releases are not the same. Many, however, are compatible with each other, which means one can be directly applied over a cured film of the other without stripping or compounding the mold. Test a small area with a high quality mold cleaner. Next, apply a coat of the new semi-permanent release. If the initial coat is difficult to apply (wets poorly), streaks or behaves unusually, STOP, and strip the mold. If everything appears as usual, follow this procedure for the entire mold.

A brand of Freudenberg.
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