How to make a
Silicone Mold and Castings
(for advanced modelers)
you start it is suggested you spruce you part. This basically means
build a stand of sorts at the bottom of the piece your are wanting to
mold & cast. ( in this picture the spruce starts at the bottom & sides
of the shoes ) This base can be made of styrene. Be sure that you build
base for reservoir.
2. Cut line onto master.
This will assist you when cutting mold . The line will become exposed
when cutting mold. Cut line should be made using a Sharpie Marking Pen.
BE SURE TO HAVE THIS LINE FOLLOW ON TO YOUR MOLD BOX before pouring the
silicone. This will help you when you de mold. Your will have a starting
3. Place Master with base
onto Foam Core. Begin the steps of making your mold box .
4. Mold limit line added
to Inner box wall. Do this with a pen. This line is where you will pour
your silicone to. Should approx. 1 / 4” to 3 / 4” above your Master.
5 Mold box walls now ready
for hot melt glue gun.
5a Inner Wall
5b Outer Wall
6. Tack mold box first
with Super Glue to maintain form
7. Using Hot Melt Glue Gun
bead and seal the entire mold box. This will prevent silicone from
leaking thru the mold wall seams.
8. Mix your rubber per
instructions given with purchase of your silicone or found in another
section of this website
9. Your mold is poured and
after 12 – 24 hours the silicone rubber has cured. Notice we exaggerated
the Hot Melt Glue around the mold box. This was done to clearly show
what is required.
All seams are to be
sealed, including the side.
10. Tear off the foam
core. Your Mater is ready to be removed from the mold
11. Mold cut line. This
was marked on your mold wall earlier. This cut is the starting point.
12. After REMOVAL of the
styrene spruce & base ( reservoir ) the mold cut line will appear (
that’s why we suggested to you earlier to use a SHARPIE ) follow your
13. Using a #11 scalpel
blade begin cutting into the silicone. The master will begin to appear.
The lines on the master will assist you in where to cut.
14. The mold now has been
cut as is required no more , no less. Spread the mold nad remove your
15. Master removed and now
mold is ready for resealing.
16. WHAT IS RESEALING.
First carefully close your mold following its original / natural seam
lines. VERY IMPORTANT. Your MOLD MUST APPEAR as though it was never cut.
This would be the ultimate sealing. This process will eliminate cast
imperfections. ( a.k.a. nasty seam lines ) Then gently wrap the tape
around your mold applying very minimal pressure. As to not compress your
mold. The tape allows the mold to keep its natural shape and form. Makes
it real easy for you when casting.
17. Mold ready for
Injection pour .Mold does not need to be separated for pouring the resin
when using this injection system. ( notice the tape around the mold )
18. Now its time to prepare to pour. Have your resin and mixing
materials ready. Casting resin , mixing cups , mixing sticks , syringe &
blunt end tips.
19. Measure Resin Part A /
Part B per instructions.
20. After pouring parts A
& B into cup X start mixing per instructions using a mixing stick. Once
you have mixed the A & B . You are ready to load syringe. BE SURE TO
HAVE READY. ( note we pigmented the resin to show following steps using
the syringe procedure )
21. Insert Syringe into
resin mix and fill syringe . Be sure to have mold ready.
22. Insert loaded Syringe
into cavity and begin to inject. You will not need to separate your
perfectly aligned and resealed mold.
23. In this photo notice
resin escaping from the other hole. This shows you that all the air has
been removed from the inside of the mold.
24. The reason we have a
base / reservoir is this allows over fill. This gives your extra surface
coverage in case of spill when moving your mold to another work area or
to your pressure pot
25. Mold ready for
26. After desired time in
pressure pot ( Marcello likes 25mins. ) Your casting is ready to be
removed for the mold. Cut tape , spread mold and release your new piece.
27. A virtually seamless
reproduction of your master has been achieved using this method of
28. This picture shows the
complete figure with its many parts ready to be assembled and painted
29. The figure assembled
This process was developed & photographed by
Join our new MPK mailing list to receive announcement about new products and
5082 Bolsa Avenue, Suite 105
Huntington Beach, CA 92649