This is Michael Knight at CASTALDO.
If you look at the instructions again you will notice that the
temperature recommendation of 310 degree F is suggested as a
STARTING POINT for developing your technique.
No Shrink Pink is extremely sensitive to temperature variations and
requires fairly precise temperature control. Most vulcanizers are of
very poor quality in this regard. I've seen brand new machines with
differences of 10, 20, 40 and, in one case, 90 degrees between the
top and bottom plates. And forget about the dial setting -- it's a
The above is the reason our instructions cannot say: do this and
you will get zero shrinkage. It's impossible for us to write
instructions that take into account the eccentricities of your
But 1,000's of mold makers have learned to use the product -- it
takes a while but it's worth it.
The procedures is outlined in the instructions: calibrate your
vulcanizer as recommended. Then make a mold, measure shrinkage,
increase temperature a few degrees, make another mold and so on until
you get the results you want. Then do that every time.
Please note that wax injections will shrink a a great deal in the
first 5 minutes, more in the next 5 minutes, and so on at a declining
rate for DAYS. So make a strict practice of measuring shrinkage under
the same conditions and at the same post-injection point. That is, if
you measure your wax 10 minutes after injection, do that exactly for
the rest of your experiments. If you measure one after 5 minutes and
the next one, because the telephone rang or something, after an hour,
you have measured nothing useful.
You can all me at 508 520 1666 if you want to discuss this further.