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Frequently Asked Questions for the Mann Website
Q. Do I need to use a release agent
to cast urethane resin into a silicone
mold?
A. No. Applying a light coating of release agent, however,
will greatly extend the
life of the mold.
Q. Do I need a release agent to cast
silicone into a silicone mold?
A. Yes. Silicones bond to each other. If casting silicone
against silicone, you
must use Mann Ease
Release™ 800.
Q. How can I make the surface of my plastic castings more easily
paintable?
A. All traces of release agent must be removed using a strong dishwasher
detergent (such as Cascade gel) and a solvent. Abrading or “roughing up” the
surface (sandblasting) is also helpful when possible. Another option is to
“powder coat” the mold before casting.
Q. Why does the surface of my plastic casting
seem to be “mottled” or
“pitted?”
A. This can be caused by applying too much release agent to the mold.
Q. What is the best method for applying the release agent?
A. Spray on a light mist coating, brush the release over the surface with a clean,
dry brush, and then apply a second light mist coating. Allow to dry before
casting.
Q. What kind of release agent do I need when casting plaster into a
mold?
A. Combine one part dish detergent (such as Joy) with 10 parts water. Then
brush the solution over the surface of the mold. Avoid pooling. This will help
with the release.
Q. Do I need a release agent when casting wax?
A. No, but a light coating will facilitate the release.
Q. What release do I use when casting urethane foam into a
polyurethane mold?
A. Use Mann Ease Release™
2831, which is a non-silicone release agent. A
silicone based release agent will mar the surface of the foam.
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