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Old 01-08-2009, 10:07 PM   #16
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Originally Posted by panhandlion View Post
I built a wooden coffee table for my daughter for Christmas. She wants it painted to match her decor.

I applied one coat of primer and plan on putting one or two coats of latec semi-gloss paint.

Question... Can I add a coat (or two or three coats) of clear water-based polyurethane over the paint?

Yes, you can put a water based clear coat (like Flecto's Diamond water based finish)

The problem is that it's never a good idea to put a hard coating over a soft one. This is an important point when it comes to applying floor finishes, but it's not even considered in painting circles. When you put a hard coating over a soft one, then impacts and stresses are going to cause the soft coating to break, and the result is that the hard coating will seem to "chip" easily. The problem is that it's not supported by an equally strong substrate.

You say you applied a "primer" then two coats of a latex semigloss paint.

You may as well apply a hard water based clear coat over what you have now, and maybe plan on stripping and repainting in future.

It would have been better to have applied a much stronger and harder primer (an Interior Alkyd Primer) and then top coated with either an interior alkyd wall paint, or a tintable polyurethane fortified paint.

The other option is to strip off the paint you have now, and start over with an alkyd primer and paint.


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Old 01-09-2009, 12:04 PM   #17
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thanks, I am on my way to get the oil base and floor paint.
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Old 11-30-2010, 01:52 PM   #18
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water-based urethane over acrylic paint

I was reading this thread and it makes sense, for furniture. I work at a nature center with live animal exhibits and MANY interactives for kids to play with. We have 30-40,000 visitors per year in the 6 months we are open. Some of our interactives are painted murals with doors in them; kids pick up the doors and see a picture or some text underneath. People apparently like to spin their fingers around the knobs, and the paint wears off and needs touching up every year. If we try use oil-based paint on the murals, it still wears off and is VERY difficult to touch-up. We prefer to use acrylic paint for the murals but would love to be able to protect it. I've had good luck with a water-based urethane on a pine kitchen counter at home. Our question is, will the urethane adhere as well over acrylic paint as it does to clean bare wood?

Thanks! Clare
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Old 04-16-2011, 09:26 AM   #19
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I just want to say I have done several home improv. project using water-based poly over paint and have been pleased with the results. Here's what I've used it on:
desk top surface that was decopauged (sp?) with vintage airplane printouts glued on then 5 coats poly over it.
Basement stairs painted red then about 3 coats poly. Holding up excellent
coffee table in living room that was painted antique white and about 4 coats poly.
bedroom dresser top got from goodwill, painted and about 3 coats poly. has held up for several years but has yellowed because I used oil based poly
various other things like TV stand, kitchen table refinish, kitchen cabinets and it's always held up well. I mean every surface needs refinishing after so many years that's just how it goes. i do have 2 little sons who beat everything up with metal tractor toys, "swords" and about anything they can play warrior with, so I get plenty of chips and dings but if you don't have rough people in your home your poly surface could last close to forever.

Overall I haven't had any problems-yes, there are bubbles but you lightly sand those between coats. I will say it's pretty difficult to get the surface smooth as silk because of these bubbles but it isn't noticeable unless your trying to feel it. I just don't recommend ever using oil based on lightly painted surfaces due to yellowing. probably be ok on stained wood though.


Last edited by annie68164; 04-16-2011 at 09:29 AM.
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