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tabar
Help - Deck Painting

Our deck is about 20 years old and has been painted a few times during this period. We have it power washed recently and to make it ready for painted or stained. We have heard two opinions, one saying that as the deck has been painted, the old paint has to be totally removed before staining and the other opinion says that we could put stain on the existing paint. We need help to determine whether we should paint on top of the existing paint or should we put stain on the existing paint or should we remove the old paint before applying the stain. Thank you for your help.

dj1
Re: Help - Deck Painting

The first time the deck was painted - was a mistake. To stain it now, the paint(s) have to be removed to bare wood.

tabar
Re: Help - Deck Painting

Thank you for your guidance.

ordjen
Re: Help - Deck Painting

Tabar,

It is always optimal to get back down to bare wood. However, if the paint was an acrylic paint, rather than an oil, an acrylic solid hide stain will adhere to it. Acrylic paints are also self-priming. You will hit the bare wood with the stain, let it dry and then coat the entire deck.

Full bodied paints are not desireable on decks because they do not let the deck breathe as well as a stain. It the moisture in the deck cannot respire through the deck coating, it will cause that coating to peel off. If oil paint were used, then peeling really can be expected. Oil paints just do not breathe as well as acrylics.

Unfortunately, the way decks are constructed, there is no way to totally keep water from getting into the wood. There are just too many vulnerable joints and hundreds of screws that are usually over-torqued , forming little craters for water to sit in. Further, most decks are constructed with the decking boards sitting right on unsealed joist, allowing moisture to be passed up from underneath.

tabar
Re: Help - Deck Painting

Thank you Ordjen, I appreciate you for providing detail information.

Condoman
Re: Help - Deck Painting

Also, be aware that if the deck is attached with nails or screws from the top then sanding could remove the finish and cause rust unless stainless steel fasteners were used.

tabar
Re: Help - Deck Painting

Thank you, Condoman for pointing the potential problem.

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