SW guy said primer can go year unpainted
Told me today the A100 exterior oil primer could go one year withouy paint. Just give it a good wash prior to painting.
I’ve sent Sherwin Williams an email to check this out. Might have to wait till spring, moisture content of wood has only been to 15% twice, but rain was coming. It would be nice if it were at least primed, some protection at the least.
Anyone here left primer on for 4 months or longer with no problems later painting it?
Replies
depends what you call 'problems'
Lot of times here a house will get prepped and primered but in the fall, the weather can turn to winter early, or late. So you have3 to wait for the following spring to get finish coats on.
Primer gets damage from the UV and weather, so you DO have to sand again to bring up fresh surface to bond to. Otherwise, you have a chaulk you are painting over. That equals poor bond for the top coats.
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Thanks Paul, I was hoping you'd chime in. Conditions are probably very similar here to where you are. Been a bad year for painting!
That's for sure. Maybe nine weeks worth of decent painting weather this year
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3rd wettest summer on record, which was preceded by the third driest winter on record. Mother nature self correcting I guess.
dockelly,You could use a water repellent like Armorall or Woodlife until you get some painting weather. I spray my house with a Roundup pump sprayer every year or two. Takes about two hours.http://www.wmbarr.com/product.aspx?catid=74&prodid=66http://www.wolman.com/product_detail.asp?ProductID=13KK
You have to be careful with water repellents, as some will tend to cause subsequent paint failure.
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Dan,These can both be painted. Don't know about others.KK
I was going to use woodlife, but the wood still had to shed the extra moisture first, and it's rarely down to 15% with all the rain we've been getting. At this point I just want to get something on to minimize work this spring. Even if it meant putting on another coat of fresh primer, I'd prefer that to all the scraping, heat gun, sanding stuff done in the past 6 months.
Wood down here on the bayou rarely gets below 18% even if it is out of the weather. If a drop of water soaks into the wood it is dry enough to use armorall or woodlife or paint.KK
SW says 15% or less. I asked the guy at the store, he said that there was no wiggle room with that number. He did say that the temp could drop to 33, 2 degrees below what the literature says, just so long as it does hit 32 within 24 hours of painting.Put so much prep in that I want this paint job to last as long as possible, 7 years here would be good.
Decided to wait till March or April. Got a moisture reading yesterday of 35. Meter only goes to 35, might have been 40 for all I know. And this was without any rain, just heavy dew. So I'll be repeating the sanding prep, bleach wash, but I think its my only option. SW responded to my email stating 2 weeks tops for primer exposure.
personal experience; I saw the most perfect paint job on an outside porch roof, 2 years old, beside the gatineau river, all seams still next to invisible, and the owner said that he was careful (anal? no, let's not judge too hastily here..) about getting finish on the day after primer was applied to (a freshly sanded) surface. Sure looked fine. (as a disclaimer, let it be said that i lived with black joe on a wall for nigh on 4 years before covering with siding. Glad clients didn't see that side of the house)
Not sure what your point is, am I right to wait, be a little "anal" and it will be better in the long run. What's black joe, tar paper?
sorry, doc.
protect the wood soon, or be prepared to clean the surface of damaged wood cells (sand, or light power-wash) to get primer to adhere well, and
apply paint to either fresh or cleaned primer. (so, either way, the surface has no loose or chalky surface to try to adhere to)
And black joe? tar impregnated fiberboard (cellotex?)
get something on it sooner rather than later. anything to stop, or at least slow down deterioration of outer cells of wood. Any finish applied to damaged / dried out surfaces sticks to ? what? and will stay how well?
Thanks!!! Have you ever had a similar situation?
I guess I'd listen to the folks from the SW factory, whatever they say.
Primers are designed to have an "open face" so that the paint that follows will stick to them well. This is accomplished through a variety of means, including having components in the primer that dry very slowly. The longer the primer is exposed the more these components dry out.
In addition, chemicals on the surface are designed to have "open bonds" that "want" to bond to other stuff (like the paint that will follow). But as time goes on, more and more of these bonds are tied up bonding to dirt and smoke and fumes in the air, so there are fewer bonds free to stick to the paint.
So how long the primer can remain uncoated depends on how the primer is compounded (and probably to a significant degree on the paint that follows). The company people should know how these factors interact.
I have indisputable evidence that primer can go several years without a topcoat -
one of these years I'll have to see if paint will stick to it....
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