Can I use Colored Polyurethane to cover blotchy staining

spot1234September 10, 2007

We have a dining set (pine table, maple&birch chairs) where the stain is very blotchy with light spots and dark spots. I think it's because they didn't condition the wood prior to staining.

The problem is that they have varnished the table and chairs and I really don't want to strip it.

My question is, I use a coloured polyurethane such as Minwax Polyshades, to darken it and hide the blotchyness, without removing the coat of varnish?

They have some really dark stains that I hope will hide the blotchyness of the table. Would I need to sand or treat the existing varnish beforehand so the new poly coats stick better?

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kmealy

While I don't have time for a detailed answer, let me just say that while "all-in-one" sounds like a good idea, it does not work in practice. It is very difficult to apply and get even coverage and avoid getting opaque. One of my friends calls it "The worst thing to happen to a can."

    Bookmark   September 10, 2007 at 8:19AM
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HandyMac

Short answer is no.

Correct way---strip the wood first.

Problem will be that pine, birch, and maple will all take the same stain differently. All three will stain with blotches due to the differences in the grain consistency.

To get the same color---or as close as can be , you will need to get to bare wood, apply a preconditioner---basically a one pound cut of shellac(very thin diluted shellac----or a comercially prepared preconditioner. Then you will need to use different dilutions of the same stain or different colors to get the same color on all three woods.

One of the problems with Polyshades is that it blotches as well. It also does not penetrate the wood much at all and can slough off, bubble, or blotch from water---rings from glasses/cups or spills).

The easiest solution might be to prime and paint the whole set.

    Bookmark   September 10, 2007 at 11:20AM
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stocky

One of the main causes of your wood looking blotchy is due to a poor sanding job. Pine no matter how well you sand almost always finishes crappy .Using a sealer or conditioner as some call it would help.
No of this matters unless your going to start from square one and strip the set.

    Bookmark   September 10, 2007 at 8:42PM
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halex57

There is a way ! The problem without stripping is it will be a darker table.
1. Throw away the polyshades.
2. You need to sand the varnish to accept new stain(actually toner).You can actually test. The higher the grit the less the toner will take.I'd start with 320.If too dark move to 400.if too light move 220 etc.Google oil toner wherever you're from.A gel stain will also work.Toner is a thick gel stain.Rub in and wipe excess.Cover with Minwax handrub poly.PS!!USE oil because if you don't like you can clean off with thinner within ATLEAST 1/2 hr.

    Bookmark   September 14, 2007 at 9:12PM
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