Before applying adhesive with a roller, it is crucial to ensure that the substrate is extremely clean. When you are standing to apply the adhesive with a roller, you may not see grains of dirt or other debris that you might otherwise have noticed with a trowel application. It is always a good idea to vacuum the floor with a high-quality vacuum system before application. In addition, make sure that your floor is flat (as opposed to smooth). Roller-applied adhesives go down very thinly, so any substrate defect left on the floor is probably going to show through. We recommend using a MAPEI self-leveling compound before installing Ultrabond ECO 379 to ensure a flat, porous substrate on which to work.
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