Female Mold Making – The plug in the previous post received 3 coats of Oscar’s mold wax and polished. Now a thickened coat of epoxy will be applied over the waxed plug and parting board. Making the mold a contrasting colour from the actual molded part facilitates the part layup process. The contrast makes voids and thin spots easy to detect during the part layup process. Mixing equal parts of red and yellow pigments produces a dull red colour. A small amount is reserved for the epoxy mixture to be used with the fibreglass cloth later.
I mixed only 1/2 ounce of epoxy and thickened with West #404 to the consistency of honey which is then poured onto the high area of the waxed plug and spread with a small brush. The material must be brushed until it begins to get and not run off the part.
The mold is completely coated and set aside to cure. The next step is to begin placing layers of fibreglass cloth on and saturating with pigmented epoxy without filler. A white pigment will be used in making the finished part to match the deck colour.
The last two pictures show the finished female mold with the parting board and plug removed. Applying five coats of Oscar’s mold release wax make it ready for use. Next step is to make the parts.