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I have a question about the proper way to prepare a wood floor for re-finishing.

I experienced flooding due to a burst water source in my house and I hired a contractor to re-finish my oak floors.

Only parts of my floor were damaged (swelling and cupping). Other parts of my wood floor were unaffected by the water damage.

My floors were originally finished 12 years ago using Boda Traffic HD 2-part epoxy (satin finish). My contractor has told me that to prepare the floor for re-finishing, he intendsto sand the damaged parts of the floor to bare wood, but to only lightly sand the existing finish on the undamaged areas (thus not sanding all the way to bare wood). He then plans to apply the Boda Traffic HD to the entire floor, so in some areas the Boda would be covering bare wood, and in other areas it would be applied on top of an existing layer of Boda finish.

Is this a good idea? For longevity and uniformity of finish, should my contractor sand the entire floor to bare wood before re-finishing? Or is it okay to only sand parts of the floor to bare wood? If he does the latter, will parts of the floor look different or will the finish not last as long in some areas since it’s being stacked on top of a layer that’s already 12 years old?
 

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I would sand the whole thing. Wood darkens with age and getting a color match will be hard. Will he guarantee in writing that the color will match? Will he do it with no down payment? If it doesn’t match, are you willing to hold his money until he does it again knowing that you might have a protracted fight on your hands?
At least talk to another contractor for a second opinion.
 
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I would be surprised if any full time flooring contractor would propose to finish the floors in this manner.The existing floors grain will have clouded in and disccolored considerably over 12 years so recoating wont do much for that.When floors are fully sanded it exposes a nice fresh new grain for refinishing so it'll never match or look right going the other route.It would actually be easier to do a full refinish whilst all machinery and equipment are on site rather than trying to do cut lines and blending etc!
 
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