So long as the wood is covered, it’s already protected and if the paint is going to start peeling off, it will do so whether it has sealant above it or not. The most important thing that you should know, is that sealing a well-painted deck, even if the deck is painted with oil-based or latex paint, doesn’t do anything additional for the deck. Paint, like a good stain, bonds with the surface at a molecular level, in a way that you can’t see but have to trust that it’s effective. Either there was moisture, uneven application, or a poorly chosen paint for wood applications. This type of damage indicates that there is a problem with the old paint’s ability to bond with the deck. If you look around a painted deck and notice that in certain areas, the paint is bubbling, cracking, or peeling away and you know that those are areas that are infrequently trafficked, you don’t want to add a sealant or even paint over it with a matching color. Water-soluble paints are more applicable when it comes to using a sealant to cover the paint. Latex and most oil-based paints do not need an additional sealant as they are more than capable of taking care of the deck by protecting it from weathering and UV-based damage.
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