Dear Mark, I don't claim to be a platinum casting expert, but look at
it as a challenging process to master.
I almost had the same thing happen during the last Platinum Seminar
we had here at the Minneapolis Community & Technical College. I
didn't cast the flask with platinum I used silver. The silver did
spray a bit but not with the fear I would have had with platinum. The
flaskless set up was slightly cracked. We also tried the quickset in
a steel flask because I had seen the cracking before. I switched to a
regular melting crucible and did not use the Wesgo crucible. We did
everything as directed.
My thought? The quickset investment has to be used EXACTLY AS
DIRECTED. Even humidity in the room can be a big problem. Did
anything change in your process or environment? How old was the
investment? Jurgen Maerz THE GREATEST PLATINUM EXPERT ON THE FACE OF
THE EARTH WAS THERE. He said cracking is a problem with that
investment. From my experience all platinum investments are not fool
proof. If I could make any one of them breath more I would. That is
my main complaint, that the air doesn't exit the flask as well as it
should. A much smoother surface could be obtained with that
Maybe Jurgen has some comments.