Hello All,
So I am doing a bunch of rot repairs to a deck that is painted.
I primed my new ACQ treated lumber on sawhorses with Glidden’s Gripper primer, and a lot of the green is bleeding through. Test patches proved that a second coat of Gripper will not solve the issue.
The current plan is to reprime with Zinsser’s Cover Stain before topcoating with latex. Anyone know if this will work?
I always thought that the copper salts were supposed to react inside the wood and become insoluble. CCA always painted well for me. Is it ACQ in general, or do I have a bad batch?
I am thinking My 2×12’s are a bad batch, because the 4×12 stringer stock was fully sealed with one coat of Gripper, even being rained on the next day. It is still white. The 2×12’s are very green at the sapwood, which has the highest preservative retention.
Bill
Replies
did the wood have a high MC count???
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming
WOW!!! What a Ride!
Forget the primal scream, just ROAR!!!
IMERC, Yes, the wood is wet. The 4x12 that did not bleed is also wet, but no problems.Bill
at a guess you are trying to put a layer or layers of paint on top of a film of water...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!Forget the primal scream, just ROAR!!!
I hear what you are saying, but it is not so simple as that. The surface of the wood was dry to the touch when I coated it a week ago. In fact, it was critical to get it covered before major checking set in at the ends of the boards.Since that time we have had a bunch of damp weather and the wood is outside on horses, so it may have gained moisture since being painted. I even primed the endgrain to defend against checking. The weather on this job has been atrocious, not the idyllic scene we often enjoy in San Diego area.
BWTB it's drawn mosisture....
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!Forget the primal scream, just ROAR!!!
Bump.Any other ideas out there? Still too wet at site to do much.Bill
shellac or Zinnser's white pigmented shellac should seal it. but again, it should be relatively dry first.Expert since 10 am.
Jackplane,Since the wood will be outside in the weather, I am not comfortable with the shellac primer. Getting the wood dry is proving to be a stinker. Treated wood is sold very wet, and the weather is keeping it wet. The jobsite has almost total shade everywhere on the property and the weather has been very wet this year so far. I have today off for anther inch or two of rain.I did some test patches with Cover Stain and it stops the green bleed. It also seems to hold back the copper napthanate end treatment (Jasco Termin-8 brand) from bleeding through.The distressing aspect of all this is that the green bleed actually formed droplets of green water on the surface of the primed wood. Given that ACQ wood is approved for outdoor structures, it seems weird that the treatment would bleed out of the wood when wetted. I never saw this with CCA wood.Bill
Get a moisture meter. If you're above 8%, painting it is just throwing paint away.
Real trucks dont have sparkplugs
Try a test area with the top coat latex. the primer is supposed to make the next coat look uniform (not necessarily the primer coat). as far as zinnser bullseye 1 2 3 is a great product. also like the kilz but only in the oil. i've also had good results with the cover stain.
Edited 2/21/2008 10:43 pm ET by deafbob
Deafbob,I did that test, and the green bled through the topcoat paint. It looks like the Cover Stain is in my future. It is bought and waiting for the weather to cooperate.Bill
Is the primer rated for treated lumber?
I use solid color stain rated for acq and have had very good results but getting your lumber dry is an important key.
ANDYSZ2WHY DO I HAVE TO EXPLAIN TO FRIENDS AND FAMILY THAT BEING A SOLE PROPRIETOR IS A REAL JOB?
REMODELER/PUNCHOUT SPECIALIST
Interesting question. I have seen no reference to treated lumber on any primer, only references to wood and exterior applications.To update you all, I over-primed with Cover-Stain, and the bleedthrough was halted. So far so good. We finally have some dry weather, so I am busy like a beaver catching up on all the work that was delayed by rain.Bill
It's my understanding that 4x and 6x PT stock are treated with a different formulation than 2x PT stock, with the 4x and larger lumber treated with a higher concentration of copper to achieve "ground contact" rating. Could explain why the 4x12 is holding the paint and the 2x isn't. I don't know, just thought I'd offer a thought on the differences you are observing.
Redford, Thanks for that.The 2x is .40 retention, I don't know about the 4x. (There was only 1 piece, and the ends are long gone from it.) I doubt it is any higher; .40 is rated for ground contact.If the formulation is different, it would be interesting to learn wherein lies the difference. The depth of penetration is similar on the 2x and the 4x, and both are incised doug fir.Bill
I was always taught you waited a year before painting or staining real wet decks