Painting over old mosaic floor?

Old 01-11-13, 06:54 PM
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Painting over old mosaic floor?

My basement storage/laundry room has a mosaic floor, which is old and very unattractive. I am seriously considering painting the floor. The plan would be :
a) an extremely good cleaning -- TSP, sanding, more cleaning, deglosser, etc
b) two coats of oil- or shellac-based primer
c) two coats of either poly-fortified gloss oil paint (e.g BM alkyd floor and patio paint) or epoxy-fortified satin acrylic paint (e.g. BM acrylic floor and patio paint)
d) If using acrylic floor paint, two coats of water-based clear poly.

Some questions
1) Is this process OK?
2) To save time, I was thinking shellac based primer (dries faster) instead of oil-based primer. Would that be OK? Would BIN do the trick on a floor?
3) Is the oil-based paint necessary? Or an epoxy-fortified Acrylic paint made specifically for floors be good enough?
4) If poly-fortified alkyd is used, would water-based clear poly for added protection be overkill?
5) Is it a good idea to do all this?

Old 01-12-13, 05:37 AM
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I'm not sure I know what a mosaic floor is

A solvent based primer is a good idea although 1 coat should be sufficient. BIN would be ok but it might be difficult to get a smooth even coat because it dries so fast. It also has a LOT stronger odor than oil primer.

You can use either latex or oil base over the primer. Oil base tends to dry to a harder film than latex paints do. I doubt there would be any added benefit by top coating the finish paint with poly.

Make sure the floor is clean [including any cleaner residue] and dry. 1 coat of primer and 2 coats of finish should produce a nice looking job.
Old 01-12-13, 05:52 AM
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This is really interesting as all of the floor paints around here specifically say "Do not prime the floor prior to painting". The reason for this is that primers dry softer than paints, and as an undercoating any torquing will cause them to peel. They all (latex and oil) recommend first coating with a 10% thinned coat, and full strength finish coat. I've done many this way and have been back several years later and they still looked good. Just my two cents for what it's worth.

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