These forces will transmit directly to the tile resulting in loose or cracked tile. If new, the slab should be steel troweled with a fine broom finish. Although a wooden float finish provides good bonding they have been found to create other problems. If a surface treatment is needed, consider the types of treatment and the limitations of each. Acid etching provides a suitable surface, but cannot be used everywhere.
Acids have little effect on oily or greasy films.
These films would need to be removed before acid can be applied. This method may not prove acceptable in closed or confined areas where acid fumes may damage surrounding surfaces. Extreme care must be utilized since personal injury and damage may result from improper handling of acids. Only qualified professionals should be engaged. Scarifying is another method that can be performed in several ways.