Does anyone here have any genuine experience with really painting CDC (ground contact yellow pine which has been high pressure treated) lumber to last? My best efforts with any other lumber has always been to use oil based primer and coat out with exterior latex to maximize finsih life. Since CDC comes kinda wet anyway, I wonder should I let it thoroughly dry first and still use oil based primer? I need maximum life here as it is for me in a permanent installation and I do not want to do this again for many years. Any help will be appreciated!
Posted by Glenn Taylor (Member # 162) on :
Preston,
I don't prime CDC.
No...I'm not nuts.
Well, I don't use primer...sorta.
The posts on our shop sign were never primed with regular primer, neither latex or oil, nearly 10 years ago and they haven't peeled yet. What I do is take a portion of my oil base top coat (in this case - OneShot lettering enamel) and thin it about 50% with mineral spirits. I apply it and let dry overnight. Then I put down my first regular coat of OneShot at full strength, let dry thoroughly, and then apply the final coat at full strength.
All I can say is that it has never failed me.
Of course, now that I've said that........ Murphy's Law will go into effect.
Posted by Michael Boone (Member # 308) on :
I like to let treated material "cure" in the air for at least 3-4 months.Go ahead and install and let the treated material dry as it does it's job. I like Glenn's formula...it will surely soak into the wood.
So sorry Glenn..even if you do know what you are doing.....you ARE NUTS just the same! If you dont believe it...take a Letterhead poll!
Posted by Dave Hodge (Member # 1415) on :
I'll be glad to get your thoughts on this one, I'm in the middle of doing a church notice board that is going to be mounted on two supports of this treated timber.If it isn't going to show, I usually let it air dry then give it a couple of coats of garden furniture stain, the rough sawn timber obviosly takes this up better than the planed edge variety.But in this case the supports will show and need painting the same colour as the board.I had thought of thinning down some good exterior oil varnish like yacht varnish 60/40 with white spirit as a sort of primer, then undercoat and gloss finish.
Posted by Si Allen (Member # 420) on :
CDC, like any lumber MUST dry BEFORE you paint it with oil base paint!!!! Otherwise it WILL peel! Latex paint will not be a problem, since it is porous to moisture!
Murphy's Law will go into effect.
