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Painting pressure treated plywood

How long after purchasing do I have to wait to paint pressure treated plywood installing on a pontoon boat?

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Posted 2013-09-28T06:38:13+0000  by RetirednNoMoney RetirednNoMoney
 

Hello RetirednNoMoney.  Welcome to the Community.

 

Painting pressure treated plywood.

 

When pressure treated material is produced a mill glaze residue is left on the wood.  This glaze inhibits the absorption of paints and stains to properly enter the woods surface.  Behr Premium all-in-one wood clearer #63, removes that glaze and allows you to paint or stain as soon as the cleaning process is completed. It is important to follow the directions on both the cleaner and the paint product.  Another product you might want to check out is Behr deckover.

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Charlotte.

 

I am a Home Depot Associate, trained and authorized to help people on the internet.

Posted 2013-10-01T19:48:51+0000  by Char_HD_CHI

 

A word of clarification here: pressure treated wood is not subject to the same "miill glaze" considerations as is normal planed lumber. Mill glaze can occur when lumber is sent through a planer to make it smooth. The rapidly spinning planning blades create heat and polish the surface of the wood. A distinct glaze  or shine can be observed on the surface of the wood. Power sanding with too fine a grit of sandpaper ( 0ver 100 grit) can also create a glaze. Paint or stain will have difficulty adhering to this slick surface.

 

The very process of pressure treating will destroy any glaze that might have occurred during milling. The lumber is immersed in  water soluble preservative chemicals under pressure in a giant pressure chamber. This drives the chemicals deep into the wood. Water swells the grain of wood, not close it! The main concern when painting or staining over pressure treated lumber is that it has dried down after the treatment.  If PT lumber feels wet to the touch and water beads on the surface, it is still too wet to paint!

 

To answer the question posed inthe original post about painting PT plywood: if it feels dry and water doesn't bead on it, go ahead and paint it. My preference for this marine application would be a dedicated acrylic primer such as Zinsser's 1-2-3, followed by a couple coats of Behr Acrylic Porch and Floor Paint. Behr P&F dries to a low, less slippery sheen. It also has flexibility of the paint film, unlike oil paints. Plywood as it ages tends to have the grain open. A flexible acrylic paint film has the ability to not break open as the grain moves.

 

When painting plywood, special attention should be give to edges. This is wide open grain where water may gain access deep into the plywood and cause delamination. Make sure it gets well primed. Also, plywoood often has voids in these edges. Take the time to fill these voids in the plies before priming.

 

If further traction is needed in this marine apllication, fine grit sand additive can be mixed into the final coat of paint. This fine sand is hardly visible, but provides needed traction to wet feet and shoes.

 

Hope this has helped.

Posted 2013-10-01T23:15:53+0000  by ordjen
 
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