Hi, I am wondering if casting investment gets old. I teach at a
community college and they have big drums of investment. I am not
sure how old they are. It seems that when I mix water and
investment, the mixture feels very thick, and I am not sure if it is
because the investment is old, if so, can Iadd more water ? If
anyone had a same experience, please let me know.
Thank you!!
Masumi Kataoka