HOW TO INSTALL GARAGE FLOORS FROM A TO Z
(NOT 1, 2, 3)
BY DONALD EUGENE SANDERSON JR - HOUSTON TEXAS USA
THE BOOK ON GARAGE FLOORS
These pictures show contaminants in concrete that exuded to the surface upon application of the wet coating. Never apply coatings over contaminants such as oil or tire stains.
This is a picture of contaminants in concrete. The contaminants are probably a combination of oil, grease, tire residue, and grime from the city streets. You must always grind thru oil stains before applying a coating. If a floor coating is applied directly over this spot without being removed first the floor coating will most likely fail. Failure always looks different. The liquid coating may bead over the contaminants as you attempt to cover the floor or the coating may cover the spot and then buckle or peel later because it could not stick to the oil, or the liquid coating might mingle with the oil before it dries making your floor permanently look something like this:
The nature of a garage floor is oily and contaminated. So you must try to remove as much of the oil as possible before grinding by wiping up any standing oil or fluids with dry rags before starting the grinding process. Acid washing is not recommended because having water inside of you garage floor that could potentially rise upwards in the form of vapor is a problem you want to avoid, not create. Additionally acid washing can burn your driveway with permanent burn marks when being washed out of your garage and down your driveway. When you grind concrete it removes the oil and the stains at the surface of the concrete and turns the black concrete into white concrete.