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Gordo what's your source of this information? In my 20 years as an industrial chemist in paints plastics and adhesives acetone was considered as one of the least hazardous common solvents
The only connection to isocyanates was as a carrier solvent for specific foam making applications.
The mixture had to be used rapidly as any trace of water reacts with the isocyanate (usually TDI, or HMDI) to produce carbon dioxide and biuret.
Acetone is voc exempt in paints meaning that it is not included in the hydrocarbon total for emissions
Interestingly diabetics produce it in their bodies and a telltale diagnostic for someone who is low on insulin is the smell of paint thinners on their breath.
Sorry for the lecture but I have a passionate dislike of false facts brought on by the current climate.