"When painting many surfaces, regardless of the paint you are using, it is very important to clean the surface well. Oils and dirt, even if not visible, can cause poor adhesion and shorten the life of your paint job. This is especially true when painting over a glossy surface. (note: Most matte or satin walls don't need much preparation.)
I recommend a quick drying household degreaser. "fantastik" or similar. If you have laquer thiner on hand that will work as well but it can be harsh on sensitive skin so wear gloves. In addition, if the surface is glossy, it is best to lightly sand it with a medium grit sand paper or sanding block. The small scratches this creates wont show through the new paint, but will help the two materials to bond together.
And finally.
When in doubt, "Kilz"! Sold at most stores that carry home improvement supplies,(IE Bering's, Home Depot, Lowe's, etc.) this product is excellent for bonding two paints together."
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