My garage floor needs a new coat of paint. What is the best garage floor coating paint?
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It is best if you do remove the old paint first.
As floor coating or paint, not to actually replace the metal.
What you should look into is an Elastomeric paint or an Epoxy floor coating. an Elastomeric Coating on a cement floor would be more effective in light traffic walk way areas (around a pool). This product has a very low sheen and dries some what rubbery and can aid in the non-slip factor. Where as an Epoxy Coating would be more effective under heavy traffic or weight (in the Garage). This product dries extremely Hard with a very high gloss finish and is very slippery when wet with out aid from sand/texture These types of coatings can be applied to any horizontal or vertical surface. Check the product label for recommendations as for use on floors. Not all products are suitable to be walked on.
any elastomeric coating
Epoxy is one of the most chemical resistant resin systems. so as for part B of your question I would say yes it is possible to remove it from an Epoxy floor. As for liquid nails itself, it is a latex based material so a rag soaked with nail varnish remover placed over the area where the Liquid Nails is then covered with a can or something to retard the solvent evaporation, and kept moist should start to soften back the latex resin making it possible to peel up. For the part about it affecting the paint , well this would depend on the type of resin system used in the paint. If it is an Alkyd based paint then yes it will soften and wrinkle the coating. If it is a 2 pack epoxy paint (as are sometimes used for floor coatings) then it should not affect the coating. But as there are many resin systems used in the manufacture of paints, I would go into it expecting the floor coating to peel. Another method would be to remove the Liquid Nails simply by chiseling it off with a sharp woodworking chisel, taking thin shavings off until you get down to floor level and then painting over the affected area.