I have seen others have good luck using polymer clay to make
impressions of intaglios, carving into stone opposite of cameos, but
I want to avoid 2 stages. I also have not had good luck removing the
clay from the glass intaglio without warping the images. The best
impession I have obtained is from Kerr Extrude Wash, but I then would
need to make another mold to get a positive, and I cringe at doing a
mold of a mold. I have bought Protoplast as suggested, a 24" x 24"
sheet, and I have made one attempt, and it's gonna take more attempts
to be sure that is good stuff.
I am still looking for a material to make a great impression of an
intaglio. This is NOT a casual question. I have used sculpey,
parafin, injection wax, sealing wax, hot glue, sprue wax and do not
get consistent or good results. It seems that with a larger intaglio
in a 1.5 x 1 inch oval there is just too much to go wrong. I still
hope to get serious with the Protoplast, but I was not pleased with
the single attempt, as it left the ripples in the flat surface
because it does not cool instantly.
I have talked to customer service at Kerr who did not even read my
questions well. I had to ask twice if Extrude Wash could be burned
out, and then when I asked if there was another material to use,
they said just use injection wax in the extrude wash, but that would
just get me another negative. I have talked to owners of other
companies at other times who were more than gracious like what to use
as a release agent for Castaldo Pink. The anwer was paste wax. I'm
going to have to give up and get more Castaldo Pink!