I poured 6 bags of this stuff onto a concrete basement slab in a new
bathroom. Seemed to do the job relatively well, but recently started
cracking. These aren't hairline cracks, but up to 1/8".

The instructions on the bag made no mention of paint on the concrete
slab (pro or con). I have paint on the floor.

Any ideas on what to do with this? I'm guessing that I'll have to rip
it out. What I really want to know is what to do next time to avoid
this painful and expensive mistake.

Thanks in advance.

Joel