As a consolidation primer for compromised gypsum underlayments, USG Durock™ Fusion™ Primer reduces surface dust and chalkiness, and increases surface hardness and internal strength of the gypsum matrix to an acceptable level which then allows the application of USG Durock™ trowelable or USG Durock™ or USG Levelrock® pourable products to repair the compromised gypsum underlayment surface. USG Durock™ Fusion™ Primer:

• Offers superior penetration and tenacious bond to gypsum underlayments
• May be applied to freshly poured USG Levelrock® Brand Floor Underlayments and USG Durock™

Brand Multi-Use Self-Leveling Underlayment after set as a surface treatment

• Is low VOC and low odor
• Provides a fast cure time