I urge you to read over this information.
If you have never worked with resin castings before. This text contains
important information regarding the proper use of your parts; failure to
read and follow this information may result in undesirable results.
Critical steps to take as soon as you’re parts arrive. The most often
overlooked and most important step to take is to clean the parts of any
possible mold release before working with them. I use mold release on
some parts to help in the de-molding process. It may be impossible to
tell what parts may or may not have mold release on them, it is very
important to remove any traces of it from your parts before attempting
to paint them.
Mold release is colorless, odorless, and may very well be on the part
without showing any signs that it is there. Some parts may also feel
'greasy' and this is a definite sign of mold release. Other times it
may dry from sitting for a long time on a part and may not be felt or
noticed but it will be still there. Dry mold release can be
“re-moistened” via the painting process causing all kinds of trouble.
Please be sure to follow the steps outlined below. If you do not
remove the mold release agent the paint may crack or easily flake off,
discolor, orange peel, fish eye, or very possibly, not dry at all. As
insurance to your part investment, this step is easy and
should not be avoided.
how to remove mold release from your parts. Assemble your materials
needed to clean your parts. You will need a bath towel, cotton balls,
Bleach White tire cleaner, rubber gloves, a bottle of isopropyl rubbing
alcohol (70% or 90%), dish soap preferably Dawn
without hand softening agents, a roll of paper
towels and a toothbrush.
Liberally spray bleach white on parts and let soak several minutes,
longer the better, rinse in warm water. Use a paper towel to remove
excess water. Use one cotton ball soaked with alcohol per resin part,
using the cotton ball now soaked with rubbing alcohol wipe down the
resin part in a circular motion to break loose any mold release. For
small parts just pour a little alcohol in a container and soak parts for
a minute or two. While the part is still wet with rubbing alcohol,
place it into the sink and proceed to wash it like you would your dinner
dishes using the toothbrush and soapy water.
Here is a tip about using primer on resin parts. I strongly recommend
that you use a sandable automotive primer. I personally use Plasticote
sandable automotive primer on all my castings with great results. Start
with a light mist coat, let dry for about half hour then prime as usual
to fill any imperfections.