Not sure that is a great idea Falcon- The isocyanate that is the catalyst in two part pants can be absorbed thru, the lungs (primary), skin and mucous membranes. It builds up in the liver and NEVER is broken down. You may not have a problem till years later when you get a primary hepatoma or liver failure. I think I read once that if you can smell it you are already 1000 times over the safe limit. Also a canister mask is like a superhighway to that molecule. Scotty
I don't want to tell anyone what to do, but here is a quote from an article on testing cartridge masks I found on Pubmed. Note that this is for guys who's job is painting cars - not us guys who use this stuff once in a blue moon...
"We conclude that negative pressure, air-purifying half-facepiece respirators equipped with organic vapor cartridges and paint prefilters provide effective protection against isocyanate exposure in spray and priming operations if workers are properly trained and fitted."
Bob