Step 4:  Making a rubber mold and duplicating clay original in wax

(Please scroll down until you come to "Next Step")

d6img036s.JPG (6879 bytes)

The clay original is now ready to be molded.

d6img033s.JPG (8942 bytes)

This mold will be made out of rubber and fiberglass.  First, the rubber is painted on in layers.

d6img024s.JPG (5756 bytes)

d6img020s.JPG (7281 bytes)

The rubber is built up to a thickness of about 1/4 of an inch and a "part-line" is constructed which will eventually allow the mold to be separated into two parts.

d6img019s.JPG (12249 bytes)

On top of the two part rubber mold, a two part fiberglass mold is made to support the flimsy rubber.

d6img017s.JPG (6672 bytes)

The edges of the fiberglass "part-line" flange are now trimmed.

d6img016s.JPG (7681 bytes)

After the fiberglass is cured and trimmed, it is removed.  (The left side has been removed in this picture.)

d6img015s.JPG (8133 bytes)

Now the right side of the rigid fiberglass mold has also been removed and the rubber mold is pulled apart exposing the clay owl.

d6img014s.JPG (7250 bytes)

The original clay sculpture is no longer needed and is removed.

d6img013s.JPG (6678 bytes)

The rubber and fiberglass mold pieces are put back together without anything inside.

d6img012s.JPG (9541 bytes)

Hot melted wax is poured into the cavity and then poured out again.  With practice, this allows for the inside of the mold to be coated with an even thickness of wax, about 3/8 of an inch thick.  I now have one hallow, wax casting of the owl.

d6img011s.JPG (8971 bytes)

After the wax cools and hardens, the fiberglass outer mold and the rubber inner mold are both removed to reveal the 3/8 inch thick wax duplicate of the original clay owl.

d6img009s.JPG (8860 bytes)

This wax is "chased" (or cleaned up) and then cut into two pieces.  Each piece is attached to a wax "tree" consisting of a solid wax "sprue cup" and "sprues" which are carefully attached to the owl.

d6img008s.JPG (10510 bytes)

Here is another wax tree with the breast and feet sections of two owls.  Every time a new bronze casting is made of "Spring Snow", it starts with a wax casting from the rubber mold.

Next Step


return to welcome page

click here to return to "How to Make a Sculpture" Index Page

return to welcome page

click here to return to Welcome Page