This is basically what I've done so far:
- I sanded the floor down to 120 grit with a drum sander (did a pretty good, time consuming job)
- Put 1 coat of polyurethane down - these problem-spots soaked it up completely
- Put a second coat of poly down and this is the result
- these problems start/stop at the edges of the boards - it seems specific to the wood
Elsewhere the floor looks really good. I can certainly sand & put a third coat down, but the fact that the finish looks like it is either cracking or not adhering to the floor has me concerned.
What could the trouble be, and what options do I have?
Update: A friend who does contracting work suspects the wood for this floor is odd-pieces and left overs; definitely possible from what I know of previous owners. The current thought is that some pieces were pre-finished with something that didn't accept my poly.