I have some buildings constructed in 1984 that have an OSB panelized siding that looks like T-111.
The stuff will not take paint. We have tried different primers, and top coats but the piant just peels off.
I remember reading something about this problem years ago, but can’t remember what the solution was.
Does anyone else remember more details?
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If the peeled paint lost it's bond........
right down to the sheathing, I would think moisture migration is "pushing" it off. Is there any paint left on the paneling below that peeled stuff?
it held for years,
I don't think moisture is a problem, as the OSB stuff is still in good shape, and water seems to bead off it.
I think the problem is that the surface was pretreated with something so that the water based paint didn't swell the flakes. The original paint lasted fifteen to twenty years.
When we tried to repaint it we ran into problems. And, I'm trying to figure out a solution short of pulling of the old siding and replacing it with Hardy Panels.
Original paint?
Can you tell what the original paint was? Maybe it was an oil-based paint? Have you tried an oil-based primer?
It just doesn't make sense that it could be painted once, but not again.
Some OSB has essentially a wax coating on it, for weatherproofing during construction. The stuff was supposed to be covered with siding or whatever, not painted, so no consideration of paintability was taken. Though your OSB apparently was sold as exterior siding, I'm guessing it got that same treatment -- probably a fly-by-night supplier.
I would guess that your best bet for getting a paint bond would be to use an alkyd or oil primer, maybe after first washing with "liquid sandpaper" to remove as much wax as possible and give what remains some "tooth".
Some OSB has essentially a wax coating on it, for weatherproofing during construction
I was thinking about that, but then how did the original paint stick for 15 years?
Probably the "just right"
Probably the "just right" primer was used -- something that bonded to the waxy coating and provided good "tooth".
What types of primers have you tried?