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A new coating may not adhere well to
a high-gloss surface, so it is recommended that all glossy
areas be dulled for the best primer or paint adhesion. Sanding
with a medium grade sandpaper works well for general exterior
work. Use fine sandpaper for critical work such as doors
and prominent trim. After sanding, remove dust with a damp
cloth. Chemical deglossers are also available, but require
care and caution. Leaving the product on the surface too
long can soften and wrinkle the old coating. Follow all
manufacturer's instructions and treat these products as
strong solvents exercising safety precautions with protective
goggles, gloves and clothing.
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