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primer
http://www.facilityzone.com/search.asp?prox=page&rorder=500&rprox=500&rdfreq=500&rwfreq=500&rlead=1000&sufs=2&order=r&pr=fzone0207&query=primer&submit=SearchUsing Primers Can Ensure Proper Adhesion of Roof Coatings
Paints and Coatings: Application Checklist
Proper Surface Preparation is Essential Before Applying Roof Coatings