| >What if they are vinyl tiles? With the self stick back?
| Maybe. He can put down three or four and see how they do.
Self-stick adhesive is very thin. It needs to be stuck down
to a clean, smooth surface. On most, perhaps all, concrete
it would only be sticking to the "peaks". If I *had to* do it
for some reason I'd use tile mastic with vinyl composite tiles.
(Think hospital floors.) But even then it would be a bad idea
to glue it over paint.
Another issue with self-stick is variability of quality: The
designs are nearly all cheap and kitschy, the plastic often
discolors and/or peels. A few years ago I did a job with
Armstrong tile from HD. I think it was "Solarium". Cheaper
than something like solid vinyl tile, but not the cheapest
level of self-stick. The mastic was sort of gooey, but I didn't
give it much thought. I figured it must be a reformulation.
It turned out the mastic was faulty. It remained gooey and
the tiles didn't stick. I was lucky in that the job was in a
rental and the building owner is a very old customer. Everyone
was happy with just putting carpet over the mess. But it
could have been a big loss for me if the customer had
demanded a refund or a suitable tile floor. If I were lucky,
Armstrong might have refunded the tile cost, but I would
have still been out for the labor and the underlayment.