I put preprimed exterior casing around several of my windows and doors
several years ago. I topped it off with oil-based exterior paint.
At the same time, I put some new trim wood (not casing) on the
outside, used an oil-based primer, and an oil-based topcoat.
Now, 5 or 7 years later, the wood that wasn't preprimed is in fine
condition. But in some cases the casing that was preprimed is starting
to peel. And it's not the topcoat peeling off the primer.
Did I do something wrong 5 or 7 years ago by using oil-based paint
over the preprimed casing?
Or is it just that 5 or 7 years later it's time to re-prepare
(scraping and sanding as necessary) and re-paint anyway?
No, the factory applied primer was some very cheap stuff.
That is true in cases where the finish takes a lot of abuse from sun
and weather. Average conditions may see a paint job last a dozen
years. YMMV, of course. Check Consumer Reports for articles over the
years on paints and testing...hughly informative.
Could be. I remember worrying 5 or 7 years ago that maybe I wasn't
supposed to put oil-based topcoats over the maybe-latex primer from
The places where it's peeling are where *both* there's some fine
detail in the casing AND where there's abuse from sun and weather.
What's sad is that I used the pre-primed casing especially where there
was lots of abuse from sun and weather, with some thought that it
would be better than what I could do in terms of putting primer over
bare wood. Maybe I was just naive.
I remember asking a professional painter once about the difference between
low-end and high-end paint. He said that with low-end paint, you'll need
to repaint in about five to seven years. With high-end paint, you'll need
to repaint in about five to seven years.
7 years ago what I was doing was replacing wood with water and termite
What I'm doing this summer is more general (but of course where it
gets wetter or more sun I have to spend more effort preparing).
I think I can tell the difference between cheap and expensive paint
when I'm applying it myself. The expensive stuff generally seems to
spread and flow better. But 7 years later, it might indeed be hard to
And I can't hardly buy oil-based topcoat paint anymore. I'm not going
to say it's impossible but I cannot buy more than a quart at a time
due to legal restrictions. I don't know if these restrictions exist
everywhere or just where I am (Maryland). The good latex stuff today
seems better than the latex of 20 years ago, I know.
Kidding aside, high-end paint DOES have some advantages, like
spreadability. I use a lot of different paints, because my clients
usually want to buy it themselves or match an old can. I just haven't
formed a clear opinion whether the advantages are worth the extra cost.
Maybe it's my technique, but I can't seem to get brushmark-free finishes
with ANY kind of paint, even using Floetrol.
I'm in Texas, and there are no limits on purchase quantities of oil-
based paints, but the last gallon I bought to do crown moulding poured
out of the can in one big glob. I had to thin it to death before it
would go on smoothly. The EPA has made the manufactures take the VOCs
(Volatile Organic Compounds / thinner) out to improve air quality, so
now the user has to put them back in, thus breaking even on air quality.
On the plus side, I got two gallons of paint in a one-gallon can.
How are we supposed to know??? :)
Maybe, maybe not. I'm sure there was information available from the
manufacturer on whether the primer was compatible w/ latex, oil, or
both, but I surely can't tell from here and now...
In general, it was most likely a dual-use primer but my experience has
been that the prime coat on most of that is _very_ thin and doesn't hold
up any better than unprimed prep'ed well and primed on site.
If it needs repainting, it needs repainting...not much more can be said.
They often use cheap, sub-standard primer. Your paint is as only good as
I had the same thing happen on some new exterior doors I installed. They
doors and frames
came pre-primed. I painted over them, and they were peeling within a year.
I had to scrape and re-do
I'm getting ready to put up some preprimed trim myself. After reading this
thread, I'm tempted to re-prime. Actually, since I have to prime the walls
anyway, it'll probably be easier to reprime than not. :)
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