During dry sanding isocyanates will be released, regardless how old the paint is. The newer the paint the more isocyanates will be released. You risk developing asthma, not really good for pilots . PPG Concept is a great paint but it requires proper precautions.
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Can someone confirm this? I understand the dangers while polyurethane is
being sprayed, and perhaps also in the early stages of curing. But I
thought the material was pretty much inert after it cured. I haven't
been able to find any warnings beyond the spraying process on the
internet. Can somebody supply more information? I'd like to be as
safe as possible. Or at last understand the dangers.

Jim Beckman