Decks, Patios, Porches and Docks - deck spots

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08-04-01, 07:22 AM
We have a pressure treated deck that is 8 years old. We have always used Thompson's waterseal on it. This spring we decided to stain it. Since that time we have had white spots appear after a rain. Mostly the spots come close to a knot hole mark. How can i stop this from happening?

lefty
08-04-01, 08:46 PM
Those white spots are a build-up of the Thompson's that you have been putting on. Knots are extremely hard wood and Thompson's (or any other sealer) will simply not penetrate it.
fewalt
08-05-01, 05:34 AM
Joe,
Lefty is on the right track. You should have stripped the
waxey Thompson's before you tried to apply a stain. If there is any kind of water beading on a deck, it needs to be stripped before staining.
fred