WHY USE A PRIMER DEFINITION A Primer conditions a substrate for the further application of a coating / adhesive. The use of priming is vital for the following reasons: Settles dust Inhibits adhesive soaking into the subfloor. This is particularly important for pressure sensitive adhesives such as Polymer 900 and Polymer 999 Increases spread rates Enhances bond strengths Note: The use of Polymer 6000 Primer will, in the long run, save the contractor money   top