Mold Mix 6
is part three of a multi-part tip on Mold Mix 6, a refractory molding
compound made by Zircar. Click here to read part one.
The process for applying Mold Mix 6 to a
model varies depending on the type of model being used. Here's
the basic process for applying to a wax positive as part of the lost
1. Simply mix up a small amount of
Mold Mix 6, then paint it directly onto the wax in thin layers.
Use a soft brush, and remember that the finish of the initial layer
on the wax will determine the finish on your cast piece.
2. Don't worry if the Mold Mix wants
to separate, just keep applying with gentle strokes. It's
usually best to start at the top of the model and move down.
3. Once you've painted on a single
layer, place it near a fan so that it dries quickly. The layer
should be tacky (but dry) before continuing with another layer.
Multiple thin layers are preferable to fewer thick layers.
4. Each layer should be painted in a
different direction. Ideally, you want the layers to almost be
woven across each other. Evenness is also important.
This gives the final mold more strength.
5. Continue adding layers until the
mold is at least 1/16th inch thick. It can be as thick as 1/8
inch (3cm) if desired, but no thicker. If the layers are too
thick they can shrink excessively and unevenly and cause problems
with the model.
6. Allow the mold to dry completely.
This will take two to three days.
Coming soon -- information on
using Mold Mix 6 with other materials, as well as information on
removing the model material from the mold.
Copyright 2006 Brad Walker.
All rights reserved.
Thanks to Melanie Rowe and
Leslie Rowe Israelson for their suggestions on using Mold Mix 6.