Achieving a Woodgrain Finish Effect
A wood grain finish can be attained through the process of mixing urethane resin with various colors of pigment. These castings will have the appearance of natural wood. Wood grain finishes can also be achieved by the addition of pecan shell flour to the resin. Different wood finishes such as oak, pine, maple and mahogany can be achieved by varying the amount of pigment and/or pecan shell flour. Finished castings can be stained and clear-coated to achieve a realistic appearance. Casting wood pieces in urethane gives the benefit of being fast, realistic and less expensive (labor, time, materials) than woodcarving. Overview - To make a wood grain casting, first a rubber mold (negative) must be made of a natural piece of wood. The liquid rubber (Mold-Max 30 Silicone or PMC-121/30tm Urethane) will duplicate the finest wood grain and yield that detail into finished castings. It is important to remember that you must seal the wood with a SuperSeal sealer to close the porosity of the wood. Once a working mold has been completed, we can begin preparing our casting resin mixture. This mixture consists of urethane resin, pigment and/or pecan shell flour. Once the desired color effect is achieved, the mixture can be poured into the mold. In about 15 minutes the finished casting may be removed from the rubber mold.
A of Resin: 100 Parts Pecan Shell Flour: 100 Parts
Apply Release Agent To Rubber Mold** - To prevent resin mixture
from sticking to rubber mold, thoroughly apply mold release agent (Manns
Ease Release 2310 Agent) over entire mold surface. Brush into all
surface detail let dry and follow with a second coat. Let dry. 2.
Mix Pecan Shell Flour And Pigment With Part B Of Resin If
using pecan shell flour in the
7. Post Finish - Lightly abrade casting with fine steel wool to promote better surface adhesion of stain and shellac. Apply desired wood stain on to the surface of your finished casting. Let this coat dry thoroughly and apply a second coat. After drying, apply two coats of clear gloss shellac spray to prevent scratches or nicks on the surface of the casting.
**Use only a release agent specifically made for mold
making and casting such as Universal