I have used gallons of awgrip two part on boats. I believe, but may be wrong, that filters do not work for Isocyanate ( though there is lots of nasty stuff in there worth filtering out for the usual reasons). Spraying indoors with this stuff kills some unlucky people even if they have the respirator, one needs positive air pressure which comes in respirators with a line feed, or breezes.
By the way, that sounds like an interesting product, I hope someone around here has it.