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I contracted to do this same thing for a customer a while back and had experience before on this BUT:::
I got my scraper and removed the layer and found that tar paper had been used to seal the floor, I guess to keep air and bugs from getting inside the home.
Anyway, the tar paper had melted and welded to the flooring. I use naval jelly, heat, sanding, and to no avial.
I then decided to relay the flooring with 1/4 inch ply wood and start over. I then laid down new hardwood planks and this worked out much better and it worked faster to me.
I used my belt sander but it kept ruining belts in an area smaller than a square foot.
Just a thought.
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