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Old 07-17-2011, 06:41 PM   #1
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Painting latex enamel over old polyurethane doors


Does anyone know If I will have any problems painting doors that have been up for 20 years and were originally stained and polyurethaned? I plan on roughing them up by sanding with rough (100), and then medium (160) sandpaper. Then priming with a latex primer and panting with a semi-gloss or hi-gloss latex paint. Or do I plan on making a mistake with this procedure? All help appreciated.
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Old 07-17-2011, 06:47 PM   #2
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Painting latex enamel over old polyurethane doors


Sounds good, just be sure your primer is a BONDING primer that will stick to the glossy surfaces. Most every major paint brand has a BONDING primer in their arsenal. P.S. And, don't forget to use a tack cloth to remove the dust after you sand.

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Old 07-17-2011, 06:50 PM   #3
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Painting latex enamel over old polyurethane doors


Thanks, especially for the "bonding" primer tip.
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Old 07-17-2011, 07:00 PM   #4
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Painting latex enamel over old polyurethane doors


Unless your surface is rough enough to require successive grits, I would just do one sand with 120, even 150, weight paper. If you're using a bonding primer, good plan, then you really don't need to go that heavy with paper, especially if you might go the high gloss route. Using 100 grit on a door surface may create scratches that appear to the eye, touch, to be gone after the 160 treatment, however, a high gloss finish may just show you how wrong you are. Use a lighter grit and let the bonding primer do its job. Have fun!
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Old 07-17-2011, 07:54 PM   #5
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Painting latex enamel over old polyurethane doors


wash,rinse,then all you have to do is go over ever inch with fine sand paper .all your doing is deglossing . wipe off any dust. for me i would use zinsser cover stain ,its a oil base .school of thought is to use a china bristle brush for oil, but i like a nylon polyester brush it leaves fewer brush marks. let dry ,caulk in any gapes ,then 2 coats top quality latex
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Old 07-17-2011, 10:47 PM   #6
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Painting latex enamel over old polyurethane doors


Thank you ALL for your responses. I am really impressed with how quickly people are willing to help.
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Old 07-18-2011, 09:24 AM   #7
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Painting latex enamel over old polyurethane doors


All bonding primers will not stick to aged polyurethane, which is basically hard plastic. It is recommended to remove this material with a P&V remover, so that there is no residue which may reject the new coating.
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Old 07-18-2011, 11:22 AM   #8
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Painting latex enamel over old polyurethane doors


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All bonding primers will not stick to aged polyurethane, which is basically hard plastic. It is recommended to remove this material with a P&V remover, so that there is no residue which may reject the new coating.
Do you mean "all bonding primers will not stick", which is another way of saying that none will? Or, do you mean "not all binding primers will stick", which is another way of saying that some will, some won't. I just benefited from my Modern College Math course. Most bonding primers are spec'd for plastic, hard or not. OP, choose one specifically spec'd for plastic and test it out. Put some on, allow it to dry two days, then press some tape onto it and rip it off. The primer should remain bonded.
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Old 07-18-2011, 03:01 PM   #9
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Painting latex enamel over old polyurethane doors


I've never had a failure using bonding primers from SW, Benny Moore, Valspar, etc.
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Old 07-23-2011, 08:37 AM   #10
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Painting latex enamel over old polyurethane doors


Thanks to everyone for taking the time to help.
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Old 07-24-2011, 09:10 AM   #11
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Painting latex enamel over old polyurethane doors


A good bonding primer or oil will be fine. My question is do you REALLY want to paint them?
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Latex Primer: Good for Drywall, that's about it.
Behr Paint: The plastic buckets are good, that's about it.
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Old 07-25-2011, 01:39 PM   #12
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Painting latex enamel over old polyurethane doors


Again,
Thanks to everyone. Mathewt1970, I am completely refinishing, flooring, baseboards, trim, etc. most of my house on weekends and days off. I have decided to replace the interior doors, trim and door stop, only keeping the frames. Wife wants to put in solid interior doors anyway. I get to hone up my carpentry skills also. Instead of sanding the frames I am using a stripper. Never done that before, takes the old poly off down to the bare wood (and stain) Heck of a lot easier than all of that sanding.

Again, Thanks to everyone for taking the time.
alan

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