I plan on using 2K poly's and I am buying a fresh air respirator because of the isocyanates. One thing I am not clear about is when the iso's are present in the air. If I spray in the booth and carry the work piece in the drying room will the iso's still be in the drying room where the pieces are curing, or just the booth where the airborne particles are located? I am just asking so I know whether or not I need a fresh air mask when I go into the drying room. Or should I just wear it when actually spraying?
From contributor F:
I would wear the mask. I was told by MLC to wear one when mixing Euro bild or EuroX because of the iso's.
Itís puzzling to me how the 2k Urethanes using isocyanate hardeners dominate the scene in European countries where formaldehyde containing coatings are out of favor if not banned. Here in the States coatings that use an acid catalyst and off gas loads of formaldehyde are still the preferred poison of the day. The priority that seems out of sorts to me is how so many finishers worry about the dangerous materials they use, but seem unwilling to invest in the most important safety feature of all - a quality engineered spray booth and air makeup. That should be job one. The rest is manageable. Otherwise it doesn't much matter whether you prefer formaldehyde to isocyanates or vice versa.