We're replacing the black, rough slate tile in our kitchen with Marmoleum Click tile. I'm using a rotary hammer with a chisel tip to take up the tile. One the tile is up there's quite a bit of thinset left behind. My questions are:
1) What is the best way to remove the remaining thinset? The rotary hammer really isn't ideal (too easy to gouge plywood). Is a large sc****r my best option?
2) When pulling up some of the tiles the bond was strong enough to pull up some of the top layers of the plywood. I also put a few gouges into the plywood (see #1 above). What's the best way to cover the gouges?
3) The marmoleum requires a subfloor that is flat to within 3/32" in 6'. If I have any low spots what's the best way to level them? Will a portland cement based leveling compound work? Would this also be good for cover the gouges in the plywood?