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Reference.org
Stain-blocking primer
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<p>Stain-blocking primers are used to cover <a href="/facts/Stain/7VhlycN8">stains</a> such as <a href="/facts/Watermark/QMzKKCLt">watermarks</a>, <a href="/facts/Nicotine/VQ6HcIrY">nicotine</a> (actually tar), markers, <a href="/facts/Smoke/KRJaumoC">smoke</a>, and prevent them bleeding through newly applied layers of paint. They also provide adhesion over problematic surfaces, giving better film leveling, and durability. Commonly used stain-blocking paints include <a href="/facts/Acrylic_paint/nunhSnlQ">acrylic</a> and <a href="/facts/Alkyd/KNUpJgKB">alkyd</a>. </p>