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oil based poly over water based poly. Will it still amberize?

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Forum topic by skogie1 posted 05-15-2017 11:00 PM 448 views 0 times favorited 9 replies Add to Favorites Watch
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skogie1

105 posts in 1202 days


05-15-2017 11:00 PM

Long story short, I have a some maple plywood that was finished with an acrylic water based top coat. I don’t like the look of it in this application and I’d like to use an oil based poly for the ambering effects. In an attempt to sand off the water based finish I burned through the veneer. So now I’m wondering what would happen if I just put the oil based poly right over the existing finish, and/or, lightly sand it with a 220 and then put the oil finish over top. Will it still yellow over time or does it need to be in contact with bare wood for that to occur? Thanks in advance for your thoughts.


9 replies so far

View DirtyMike's profile

DirtyMike

637 posts in 741 days


#1 posted 05-15-2017 11:03 PM

big box store plywood has a thin veneer like that and its a pain to refinish. Have you tried chemicals to remove the acrylic?

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skogie1

105 posts in 1202 days


#2 posted 05-15-2017 11:23 PM

No because the plywood is set in place. It’s part of a kitchen remod and it forms the back of a cabinet run so I’ve been avoiding stripper because the ply butts up against the wall on one side and the floor along the bottom. I don’t think I could avoid getting the stripper on the wall and the floor. But maybe I don’t need to run the stripper right to the edges? I’ve never used chemical stripper before. As I’m sure it’s obvious at this point, finishing isn’t my strength.

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MrUnix

6012 posts in 2038 days


#3 posted 05-15-2017 11:30 PM

Oil based poly is amber in color… regardless of what it’s put on. The more coats you use, the more amber it gets.
As for if it’s compatible over your existing finish… there is a simple way to find out :)

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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skogie1

105 posts in 1202 days


#4 posted 05-15-2017 11:32 PM

Yeah I’m just going to do a pass with 220 and then put on the oil based and see how what happens. Thanks guys.

View Carloz's profile

Carloz

981 posts in 430 days


#5 posted 05-16-2017 12:04 AM

You will get the worst of both workds: yellow color without nice grain highlight oil brings up.

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skogie1

105 posts in 1202 days


#6 posted 05-16-2017 12:11 AM



You will get the worst of both workds: yellow color without nice grain highlight oil brings up.

- Carloz

I had that realization about 10 minutes ago. What do you recommend? Should I try and sand it off or should I use a chemical stripper? The plywood touches the floor at the bottom and the wall at one side. I’m worried about getting the stripper on the wall and the floor.

View Fred Hargis's profile

Fred Hargis

4762 posts in 2332 days


#7 posted 05-16-2017 11:16 AM

You’re in a tough situation, and one that has no easy fix. Even if you strip the finish, the wood may still be sealed negating the effects of anything you try. Back to your original question: the “amber” effect in oil based finishes is caused by the linseed oil. It does shift even more to yellow over time, but may not be what you want. But it will stick to the waterborne finish, assuming it hasn’t been contaminated with grease or silicone (furniture polish). But given that you’ve already damaged the veneer, maybe consider applying a piece of new veneer, the PSA kind to the surface and then finish that. If you don’t like that idea, you could (maybe) use a toner, but that is sprayed and could be just as much a problem as the stripper.

-- Our village hasn't lost it's idiot, he was elected to congress.

View ClammyBallz's profile

ClammyBallz

424 posts in 975 days


#8 posted 05-16-2017 03:32 PM

The other option is rub on a couple coats of thinned Sealcoat shellac to get the tone you want, then finish it with more of the acrylic water based top coat.

View AlaskaGuy's profile

AlaskaGuy

3661 posts in 2148 days


#9 posted 05-16-2017 03:55 PM

I like Fred’s idea of PSA veneer over the the top. This is what many do when kitchen re-facing.

-- Alaskan's for Global warming!

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