"Goof Off" will remove the latex paint without damaging your flooring. Any hardware store has it. Do NOT wax your floors if you have polyurethaned them. It will not work, and you will have a terrible time cleaning it off when you need to re-coat the flooring.

We have just installed Hard floors on Concrete using the glue down method. Unfortunately, my husband also got glue on our floor as he was installing. We saw in another chat thread that Mr.Clean Magic eraser works on the dried glue. I had my doubts, but decided to try it anyway. It REALLY works. The Bostik and Mopei cleaner does work too but leaves an oily residue on the floor, which then needs to be cleaned up, I've heard that denatured alcohol works good with this, but have not tried it yet. Has anyone else had experience with that? I've used Magic Eraser, Bostik adhesive remover, Mopei adhesive, and then cleaned with Bruce and Bona cleaner, and so far nothing has hurt my floor! It's hard work but gradually we are getting it all up!

I'm not quite following your thoughts on the repair but they have used a piece of plywood between the old hardwood flooring and the new bamboo floor. It sounds like you want to remove some of the planks in order to have the voids filled with a continuous longer board rather than a short piece. Have you read about how to replace a damaged tongue and groove board? I think they cut along the joints of the board to remove the middle section and then chip the rest out of the T&G areas. Placing that one new board in would require removing its tongue in order to be able to slip it into place next to an existing board.

Ok...so the first thought is "Not enough finish". A floor traditionally has a total of 3 coats applied. The first coat is often a sealant of some sort. Then two coats of polyurethane after that. If they don't use a sealant...then there are THREE coats of polyurethane applied. This is the MOST COMMON way to go about finishing a floor. We've seen HUNDREDS of people having "2 coats" applied on their floors on Houzz and they are complaining because the floor is "gritty" or "not smooth". That corrects when things are done properly. The other concern I have would be "light spots". Your photo doesn't show them. I think I spy very small spots in the upper left of the photo. It almost appears "milky" or gives a bit of a bluish tinge. Am I correct? I worry that this might be an indication of adhesion concerns. Don't panic just yet. You will know if this is an adhesion issue pretty quickly. The "buffing" they are doing is what they are SUPPOSED TO DO between coat #2 and coat #3 (which is what was missing in the first place) will knock anything loose that isn't well adhered. If there is a BIG issue, then it will show itself with the buffing. Not always...but often. And they are not "removing" finish, they are buffing it. Getting it smooth and giving it a bit of "tooth" (scratching it up a bit so that another coat of finish has something to grab). That's supposed to happen. Once the buffing is finished, they need to do a bit of a tack cloth. Then the final coat goes down. That should be it. If after the third coat you see whitish spots showing up, then you need to contact them again.