Yes, the new Quick-Sil is okay only for relatively strong
models that can take some pressure.
But you are mistaken about the difficulty of using new
LiquaCast liquid RTV. To beginning with, you don’t vacuum until
all the bubbles are out and the cows come home. Unlike
traditional silicone rubbers, it will never stop bubbling. Just
vacuum for 5 minutes before pouring and and another 5 minutes in
the mold frame.
If that's too long, there are two tricks from the old days
that is also useful for people who don’t have a vacuum pump.
the first is to paint the model with a an artist's brush dipped
in the rubber – working time is 45 to 50 minutes, so that’s not
a problem. Examine the painted model under a loop for bubbles and
use a pin to burst any you find. End of process.
Or dip the model upside down in a container of the liquid
rubber, let it drip off a bit and then use the process outlined
above. It works and its cheap & easy.
My offer of free samples to you and anyone else who gives me
their shipping address still stands.
F.E. Knight, Inc., 120 Constitution Blvd., Franklin, MA 02038 |
508/520-1666 FEKnight@ziplink.net |