HELP! I need to do a high quality job on this floor and am at a loss how would be the best way to do it. This is a concrete slab floor that was poorly painted. I don't know what kind of paint was used. The living area appears to have been rolled with polyurethane varnish but for all I know it could have been a glossy sealer. The garage area was painted with your typical speckled garage floor paint. Both areas have several large areas where the paint or varnish or "whatever" is peeling in small patches. We suspect that water on the floor from flooding has caused moisture to come up through the concrete causing the paint to peel. The clear coated area has to be refinished. It needs to be re-painted with a clear coating and look like it was never "fixed". What do I need to do to prepare it for re-painting (re-varnishing) and what kind of paint/varnish/sealer do I need to apply? I've considered renting a floor sander but don't want to mess up the surface... not sure which is my best way to go about this job... really would appreciate suggestions. Doing a chemical paint removal seems possible but I'm afraid to do that on this type of surface.

Hey all new guy here and i have a question already.:) I have a stand alone shower stall and the paint is all flaked off around the top,about 2 inches wide from the top of the shower up the wall.Is there a special paint i can use to stop it from flaking like this.A paint and some kind of sealer?I would do like a 4 inch band around the top. Thanks!