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Poly over latex paint

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Forum topic by rfusca posted 10-02-2013 01:18 PM 6861 views 1 time favorited 9 replies Add to Favorites Watch
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rfusca

155 posts in 596 days


10-02-2013 01:18 PM

So, I’m finishing a small kids table and I was trying to use products I had on hand. I covered the top with a blue latex paint, did three coats, 24 hours between each coat. At the end, the blue looked good, but I knew I needed something over the latex for a kids table top. (I would have used an oil based paint, but I really needed to use up the blue latex.) I waited 5 days after the last coat of latex before starting to cover with poly. So, I had some water based clear polyurethane – the directions say to do at least 4 coats and at least 2 hours between each coat. I did two coats last night (2 hours between each coat) and woke up this morning…and it turned it yellow! I didn’t think water based would do that?

What went wrong? Do I have to strip and start all over?

-- Chris S., North Atlanta, GA - woodworker,DBA, cook, photographer


9 replies so far

View Clint Searl's profile

Clint Searl

1479 posts in 1114 days


#1 posted 10-02-2013 02:57 PM

Obviously, a reaction of some sort, any explanation of which would be pure speculation. For colored work, I prefer flat acrylic wall paint (Behr) topped with waterborne poly floor finish (Varathane). Never had a problem.

-- Clint Searl....Ya can no more do what ya don't know how than ya can git back from where ya ain't been

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ZacD

34 posts in 512 days


#2 posted 10-02-2013 03:44 PM

Did you recently purchase the poly or have you used it in the past with good results? I’ve recently seen some cans of polyurethane labeled clear and then in smaller print somewhere, they’ll slap an ‘antique’ on there too which looks pretty colorless in the can, barely noticeably yellow when going over white paint but then looks like someone threw honey all over your cabinets when it dries. Otherwise, it could be a bunch of things. What type of latex paint did you use? Poly should usually be fine over latex in any regard.

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rfusca

155 posts in 596 days


#3 posted 10-02-2013 03:56 PM

The poly I’ve used over stain in the past without yellowing and its label ‘crystal clear’. I’ve tried sanding it off, but it looks like I’d have to strip the paint off too. At this point, I’m considering rough sanding, tsp, primer, and repainting with Ben Moore Advanced alkyd paint and then polycrylic spray. I’d have to buy some stuff, but I’d be more sure of the results.

-- Chris S., North Atlanta, GA - woodworker,DBA, cook, photographer

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Don W

15572 posts in 1320 days


#4 posted 10-02-2013 04:20 PM

I’ve never had luck putting poly over paint. I’m not sure if it’s doable or not, but I never did it successfully. If I want clear over paint, I use lacquer, but I don’t have the need very often. I think shellac would work as well but I’ve never tried.

-- Master hand plane hoarder. - http://timetestedtools.com

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rfusca

155 posts in 596 days


#5 posted 10-02-2013 05:00 PM

@DonW – Lacquer sounds like a good idea – I’ll give that a try.

-- Chris S., North Atlanta, GA - woodworker,DBA, cook, photographer

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oldretiredjim

189 posts in 1138 days


#6 posted 10-02-2013 05:08 PM

basketball floors is some kind of poly over paint

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DaleM

924 posts in 2136 days


#7 posted 10-06-2013 04:33 AM

I just used some Minwax water based polycrylic clear gloss from a rattle can over white latex paint (Behr paint and primer all-in-one) and had no yellowing at all. It looked very good and went from a fairly flat look to a glossy look and feel after only two coats. I’m not sure what you used, but just sharing what worked for me.

-- Dale Manning, Carthage, NY

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gfadvm

11549 posts in 1443 days


#8 posted 10-07-2013 12:48 AM

I rolled Polycrylic over Behr latex on my shop shelves and got no yellowing at all. And it has held up well.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View baileyst's profile

baileyst

46 posts in 525 days


#9 posted 10-07-2013 02:58 AM

When I finish corn hole boards I use varathane poly over valspar paint from Lowes and I have never had any discoloration. I’m certainly not an expert but I’ve had pretty good results with this combo.

-- Bailey Indiana

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