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Answer:
Although
silicone mold rubber (Mold Max™,
OOMOO™
and Smooth-Sil™)
won’t stick to much and has the best release properties of the
most common mold making mediums used today, it may stick to
surfaces with open pores (open grain wood, very dry plaster,
concrete, etc.). It will also bond to glass, surfaces coated
with shellac and itself (which is an advantage if you need to
add new silicone to an already cured silicone mold).
Some tips
for sealing a Model Prior to Applying Silicone
•
Use
an acrylic spray such as Krylon Crystal Clear™.
•
Use petroleum jelly thinned with mineral spirits (be careful
not to leave brush strokes – rubber will pick them up and
they’ll show on the mold surface.
•
Use a wax such as Sonite Wax™
(from Smooth-On) or Butcher’s Wax (Home Depot). Again,
be careful not to leave brush strokes on the model.
•
Use SuperSeal™
(from
Smooth-On). Advantage: It is a
soap
blend that doesn’t interfere with surface detail and can be
completely
removed from the model surface with
warm water after
use.
•
Use Ease Release™
200
(from Mann Release
Technologies) to release silicone from silicone and other
surfaces.
• Don’t wipe model down with alcohol prior to applying
silicone rubber.
• Don’t Use Shellac! – shellac contains alcohol and the
rubber will bond to the model.
• Don’t use a release agent that contains silicone
(Universal™
Mold Release). These types of release agents may act as a
bonding primer for silicone rubber. Use only Ease Release™
800.
And,
As Always – Don’t Risk It.
If you have doubts about the compatibility of a sealer and/or
release agent with a rubber, do a small test first on a
non-critical piece.
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Smooth-On