Polyurethane peeling from hardwood floor

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  #1  
Old 01-20-15, 08:43 AM
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Polyurethane peeling from hardwood floor

About a month ago my friend and I refinished his white oak floor. The floor was drum sanded with 36 grit, 60, and then 80. It was also edged with the same grits, and screened with 100 grit prior to staining. We used minwax stain and minwax fast drying satin. The stain went on well and was given 24 hours to cure prior to coating with poly. The first coat of poly went on well, with some minor bubbling. We screened with 220 grit screen and then re applied.

The floor looked pretty good after the second coat went on but there was some spots my buddy was not happy with, so he paid a professional in the area to come back and screen and recoat the entire floor to eliminate some of the applicator marks and lines we were leaving during the application. He applied masterline polyurethane in satin.

After he left and the floors dried everything looked really good, however over the last month spots on the floor have began to chip and flake away, and the top coat does not seem to be as resilient as it should be. I have attached a photograph of what I am talking about. There are basically spots like this in every room in the house, some worse than others. The finish seems to keep flaking off if you pick at it in these spots.

Is there a solution for this? What could have caused this to occur. It seems like the only coat this is coming off is the top coat, the two coats that we did seem to be fully adhered.

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  #2  
Old 01-20-15, 09:50 AM
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Welcome to the forums!

Apparently the top coat didn't bond well to the underlying poly. The 2 main causes is lack of sanding and/or a containment on the underlying poly. I assume you used an oil base poly, was the coat the pro applied oil base or waterbased? Water based poly doesn't adhere to oil base all that well. Have you called the pro to see what he says?
 
  #3  
Old 01-20-15, 10:25 AM
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He used oil based poly as well. He believes we did not let the stain dry completely before we applied our coats of poly. However the coats of poly we applied seem to be correctly adhered and his coat is peeling.
 
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Old 01-20-15, 12:44 PM
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Sounds like he's not wanting to admit he goofed. I'd try to get him over there to present his case. If what he says is true - the poly would peel down to the stain. I've applied a lot of sanding sealer over wet stain on woodwork [spraying it on work benches] and never ever had an issue with the stain not being dry. The big thing with stain not being dry is the solvent in the poly can rewet the stain and a brush can move the stain around. Stain that's not completely dry will pose a problem if a water based poly/varnish is applied!
 
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Old 01-21-15, 08:11 AM
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As Mark said, how far the poly peels is going to be important. I agree that so far it sounds like the guy you hired goofed.
 
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