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About six months ago I painted my pressure treated Southern yellow pine handrails and balusters with one coat of zinnsers oil based primer, then two coats of sherwin williams white exterior. It was new construction, but they had been nailed up in place for about three months before they had any paint. last week I noticed staining/ bleeding all over the place.
my question– The weather has been damp and cool lately– When it dries out will the staining bleach out in the sun? If I must repaint– would an oil based primer be necessary again, or should I use a shellac primer or just another coat of Sherwin Williams white? There is quite a bit of work and expense involved, so I want to get it right this time.
Thanks to all for your opinions. Charles Elkins
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I always wait a year before painting PT SYP. Might as well wait 'till next summer and see what you've got by then. Could have some blistering because the moisture trapped in the wood will boil out in the hot sun. The vapours will raise paint.
*If the PT had knots and deep, dark grain patterns, it is leaching. The primer you used is not the correct primer for this situation. You need a primer that seals knots and tannins. Zinnser makes one called B-I-N (white and red can), and Sherwin-Williams also makes one (help me out with the name here fellas - XIP?)These primer/sealers are shellac based, and will seal in the tannins and leaching oils of the knots and deep grains of SYP. I personally use Zinnser brand Bullseye 1-2-3 (2 coats) and a premium top coat. When priming, I make sure the wood looks like I painted it white, versus an opaque, almost clear look (too thin of coat of primer). I have never had a problem with leaching or bleed through. If the knots are many, and the grain deep and dark, I use the B-I-N primer/sealer. James DuHamel