Thank you Gordon... I really appreciate the article. What I can't believe is that there was no mention of this in the instructions that came with the molding and casting kits!
I didn't think anything of it when I had an asthma attack later because I've been having them a lot lately anyway. They had almost stopped but then I got pneumonia earlier this year and my lungs haven't been right since.
Last night after we did the casting, I vacuumed the whole house, upstairs and down, cleaning baseboards, under the beds, closets, etc. I figured that overexerting myself had caused the attack. I'm sure the fumes didn't help any.
Thanks again for the article!