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Some
paints cure by an auto-oxidative mechanism. In specific circumstances,
such as when a large surface area of uncured product is confined to
a small volume and is in contact with air, this reaction can generate
dangerous quantities of heat and lead to spontaneous combustion. Examples
of such circumstances are balled-up cleaning rags; filters on spray
booths and piles of semi-cured film scrapings or over-spray. Such waste
should be disposed of under water to eliminate the hazard.
The products most at risk are any solventborne products, Resene Waterborne
Smooth Surface Sealer and to a lesser extent Resene Waterborne Colorwood
and Woodsman. The greatest danger exists with products with higher resin
contents as pigments tend to dilute and dissipate the heat.
Therefore the higher resin content Resene Qristal Clear Poly-Gloss has
more potential danger than Resene Super Gloss, which in turn is worse
than Resene Lusta-Glo. The inherent curing rate of the resin also impacts
on the risk, which makes Resene HD Poly-Satin more prone than Resene
Qristal Clear Poly-Satin.
In all cases, be aware that oil soaked rags may spontaneously generate
heat and catch fire. Fully wash contaminated clothing as soon as possible
and rinse impregnated rags with detergent and water before safely disposing
of them.
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