You can purchase garage floor epoxy paint at most home improvement and hardware stores as well as many online websites. There is no doubt about it, a new coat of paint on a drab concrete floor will make the space look clean and bright.
However they don't always work the way you expect. Frequently applying what may seem inexpensive paint costs more in the long run when it starts to chip and delaminate.
First a little about concrete. Concrete on grade and especially below grade like in a basement will have moisture issues. Water will run along your foundation walls and eventually get under you concrete slab. Excessive moisture pressure under the slab will start pushing moisture vapor upwards through the airholes, capillaries and cracks in the floor. Moisture vapor pushes salts upwards through the concrete as well. If you've ever noticed a perpetual dust on your concrete floor well this is the cause.
You may try and sweep the floor but to know avail, the dust keeps coming back. At this point you may figure that you've done your best trying to clean the surface and what the heck I'll just paint the floor, maybe add a few extra coats. This doesn't work since garage floor epoxy paint won't stick to dust for long. Of course it will look good when you're done but that's the last time it will look good and goes downhill from there. You may even notice within a few days a few small chips. From there it just gets worse.
There are a few solutions that will help increase the adhesion of floor paint. Start by checking your floor for signs of moisture. Put a rubber mat down on the floor or tape plastic to the surface in a few spots and wait a few days. If you find condensation or it gets wet underneath you will need an epoxy waterproof coating that works as a topical moisture barrier.
If the floor is free of moisture or is above a basement you should etch or have the floor mechanically prepped with a shotblaster or floor grinder. It is important with concrete to profile the surface area providing more floor for the paint to stick to. Many manufacturers suggest an acid etching solution. The problem with an acid etch with a liquid is that you will be applying a very diluted ineffective solution on the floor. You might feel good that you etched the surface but it probably didn't work. In addition to a diluted acid concrete is never flat. The water and acid solution will flow to the low spots having minimal impact on the high spots.
You can use a gel acid which can be rolled on providing an efficient predictable result. Gels provide an effective profile that works on the high spots as well as the low spots. Then the gel can be cleaned off.
If you will be driving on your surface keep in mind that the friction created from driving get your tires hot. Floor paints do not have the capability of handling extreme temperature changes which is why you see floor coatings come off the floor under tires. In the garage you really need a high performance system. It's worth the extra money to do it right. If your floor has low impact and is free of moisture a properly etched surface with a garage floor epoxy paint will suffice. If it doesn't perform it's likely moisture and salts causing the problem.
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