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You don't need to seal your deck after painting it because most exterior paints are waterproof and weather-resistant. While stealing is not necessary, it can add an additional layer of protection.

It is not always necessary to remove old stain before restaining a deck. If the previous stain is in good condition and is compatible with the new stain, you may be able to apply a new coat after thorough cleaning. However, if the old stain is in bad condition, flaking, or peeling, it is best to remove it completely to ensure an even surface and proper adhesion for the new coat. Staining over a damaged layer can lead to an uneven finish and poor penetration. For best results, test a small area first and consult the stain manufacturer's guidelines.

The best paint for an older deck depends on the material and whether or not your deck already has a coat of paint. Generally, if your deck already has paint on it, you should choose the same type of paint when repainting the deck. For example, if an old deck has oil-based paint on it, stick with oil; if your deck has water-based paint, choose water-based paint. 

It’s often best to spray on deck sealer. Sprayers can apply sealant more quickly and evenly than rolling while still enabling you to reach tight spaces. When using a sprayer, always use a low-pressure setting at a close distance to ensure an even application. Avoid using sprayers on windy days.