Choosing the correct wood finish

puzzlefanJuly 27, 2010

We put polyurethane over all the wood trim on our windows as recommended locally. This was a bad choice. The sun just makes it peel away. Now I have to start over with fresh sanding and stain. What topcoat is permanent given the harsh sunlight?

Thank you for reporting this comment. Undo
paintguy22

How long does it take for the sun to make it peel? This is usually not a normal thing. Sometimes moisture from the windows leaking onto the stained surfaces can make the poly peel sooner though. I have used varnishes, lacquer and poly and all have held up well for years of service. There has to be something else going on.

    Bookmark   July 27, 2010 at 9:55PM
Thank you for reporting this comment. Undo
Faron79

What PG said...

Poly just doesn't peel for no reason.
There has to be something else happnin'!
>>> It's almost alway related to moisture....

1) What type of windows are they?
1a) How old are the windows...?
1b) How well insulated is the window area?
1c) What was the original finish & wood-species?
2) Does the wood trim get frost running onto the wood?
3) Does just the bottom trim peel, or is it uniform around the whole window?
4) Are ya sanding between coats, when poly is hard enough? This takes many hours typically.
5) Exactly what brand/type/sheen are you using?

Faron

    Bookmark   July 28, 2010 at 12:49AM
Thank you for reporting this comment. Undo
puzzlefan

The windows are eighteen years old (anderson) but not scheduled for replacement. It is a yearly thing and moisture getting in is probably part of the problem. My neighbor suggested I used some sort of finish that is normally applied to boats. If this would work, what kind would I buy?

    Bookmark   July 28, 2010 at 10:45AM
Thank you for reporting this comment. Undo
sombreuil_mongrel

Are we talking inside our out?
What was on the wood originally? Did you clean and prep sand ? Acrylic poly over oil varnish is gonna peel.
CAsey

    Bookmark   July 28, 2010 at 1:37PM
Thank you for reporting this comment. Undo
puzzlefan

I guess I would say the windows are "outside" in that the trim around the windows faces outside and is exposed to the sun and other elements when opened or perhaps even closed (moisture). I used a Varathane stain and a plain polyurethane, satin, over that.

    Bookmark   July 28, 2010 at 6:00PM
Thank you for reporting this comment. Undo
paintguy22

Yes, the product used on boats would be a marine varnish. Instead of this, I would use Sikkens Window and Door in satin. But these are generally products that are designed for exterior use. They take some time to dry and will stink up your house pretty good. I would take the windows out if possible. I think what you could be experiencing is trying to finish wood that is really too beaten down by the sun to hold the finish. Or you could be trying to finish over a finish that is not compatible with the one you are using (poly over shellac, poly over a water based coating, etc). But, overall, window sashes are a pain. Usually, they are not finished properly to begin with by the painters or the homeowners so it does not take the sun long to wear away that weak layer of finish and get to that stain layer. The sun coming through the glass has a sort of magnifying effect on the stained surfaces which will accelerate the time it takes for the finish to degrade. This can be made worse when moisture is involved....the frost from the glass can seep onto the horizontal areas and puddle there and then the sun comes along and cooks that moisture. This is why you see so many people with windows that have turned black and have developed water stains...it just doesn't take long.

    Bookmark   July 28, 2010 at 8:23PM
Sign Up to comment
More Discussions
First Time Homeowner - Interior Paint Decision ProMar/SuperPaint/Aura?
Here we go... I just purchased a 1950s midcentury modern...
jstem20
Painted Ceilings
What is the general consensus, or majority opinion,...
okla78
Any opinions on behr premium plus ultra paint?
I am considering using behr premium plus ultra paint...
texasjg
Help me find this wall paper please
Hi all. I'm new to the forum and excited to be here....
sasseeash
Just painted kitchen cabinets, now the paint is easily peeling.
My kitchen cabinets had a natural, grainy wood finish....
iris_bulb
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™