3. Measure water in graduated container.
Tech people from the companies that produce investment tell me to get
best results, weight water not use graduated container.
I did test this and measuring has a different result than weighing.
The problem for me, is with satin cast 20 vs prevest, satin cast sets
up here in Denver faster than prevest at the same ratios, water and
investment weighed. The solution for me was to use 43 to 100, instead
of ususal recommended 40 to 100, cold water from the tap (winter
water in Denver is cold), mix three minutes, vacuum 1 1/2 min after
boil, fill flask and vacuum 1 1/2 after boil, set aside where they
are not disturbed. I wait 2 hours, steam dewax, and into the kiln.
The mess from hot water investing was not worth doing it that way for
me. I get good results from what I do.
The problem I have, is no matter how careful I am with increasing
temp slowly, if I do not steam dewax, some sterling pieces have large
rough textured warts , and the gold pieces come out without the