I’m trying to reproduce the front of an antique button in wax so I
can make it into a pendant. The design contains a scroll with raised
Latin text that’s about 1mm in height. I can see the text clearly in
the mold (made of Castaldo Gelato silicone mold rubber). It’s a very
clean, crisp mold of the design. But when I inject it, I can’t get a
good wax of this button.
Either the letters don’t fill and just look blurry, or tiny air
bubbles fill in the tops of some of the letters (only the ones
nearest the center of the design), leaving pin holes that are just
too small for me to fill without destroying the surrounding letters.
I’m currently using Kerr purple accu-carve wax in my injector, and
I’m using a spring-loaded mold clamp to hold it while injecting. I’ve
got half a dozen vents cut in both the front and back of the mold.
There is talc in the vents. I do not have any vents cut right up to
the lettering because the surface surrounding the scroll is mirror
smooth. I don’t want to put parting lines across it – I know I
could not get the surface perfectly smooth again if I cut it.
I’ve tried filling it right side up, upside down, smacking it on the
bench to loosen the air bubbles after I fill it, standing the mold
clamp up on end so the fill hole points upward as it cools–no
changes. I still get the little pin holes in the text. I’ve tried
injecting at different pressures–no improvements.
I get slightly more readable results when I heat up the mold with a
hair dryer before I inject it, but the pin holes still happen.
There has to be a way to get raised text like this to fill
cleanly–I see it all the time on class rings.
How can I get the text in this mold to fill?