Went on the OSHA site and they have a minimum at which you should be alarmed about. Don't think this job would be above that. Still, your advise on wetting it down was the same thing they said. Excellent advise. I believe they said thet the real danger was constantly working with it. Don't think one small job like this is a real hazzard. Like you said, it is only dangerous when airborn. So wet it down people. Ron J.