15 Already painted wood Already varnished or painted wood surfaces that have to be maintained and if they are in good condition, are lightly sanded with finegrain sandpaper (#180-#220), to create proper adhesion conditions for the varnish or enamel paint that will follow. Please keep in mind that any new, or already painted, wood surface that will receive any treatment, should be sound, dry, free from loose sections, peeled paints or varnishes and clean of dust, oils, salts. Equally important is the treatment of their infestation by woodboring insects and mold that make their surface problematic (if any). In case the existing varnish or paint has peeled off or is in bad condition, its complete removal by mechanical means or by using a strong corrosive product, such as DUROSTICK D-26, is highly recommended. D-26 has a controlled flow and is highly effective, even on vertical wood surfaces. It is applied with a brush in a thick coat on the surface and after a few minutes, the existing layers are removed with a putty knife or triangular scraper with ease.
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