Completed Sanding, two questions before applying urethane finish.
After two days of hardwork (and inhaling quite a bit of sawdust), I completed sanding the hardwood floor with the a rented U-Sand. Going to apply the Minwax water based oil modified finish. Not going to stain. However, before I begin I have two questions which I'm still not very sure about.
1. There are some small spots (dents, low areas, edges, corners, etc) where the old Oil polyurethane is still there. I can remove those with my detailed sander and hand held random orbit sander. But there are a lot of those spots, it is time consuming work and I might miss a few. I know it wouldn't look as good, but would there be any issues if the new urethane is applied on top of them?
2. Originally I was going to use tack cloth to wipe clean all the dust once I sweeped and vacuumed, but then I found out tack cloth might leave wax residue behind that will screw up the Urethane. Likewise, Mineral spirit can apparently stained the raw hardwood (and I'm not sure how it will react with the old left over urethane spots). What options do I have to get the last bit of dust out? Would buying bunch of microfiber cloth and wiping the floor with them work?
The new finish should stick, even to the dented areas.. U sand's don't sand that deep, so the best way to refinish wood floors is with a drum sander, edger, and buffer, u sands are really for light sanding.. But if you can live with those spots, then their should be no bonding issues. Also, I would clean the floor with a micro fiber dust mop that is very lightly dampened with mineral spirits. It will not stain the floor. Just be sure it is all the way dried before you apply sealer. I prefer oil sealer even when using water finish.. Duraseal is a good one. Hope this helps.