A high-solid, non-shrinking, moisture-cure silicone mastic used to seal any cracks, splits, or weak areas prior to applying ALCM Silicone Roof Coating. Excellent for sealing seams and fasteners. Low VOC’s, solvent-free, and minimal odor.

ALCM Silicone Roof Patch can even be applied underwater.

Excellent adhesion to almost any common building material including:

• Concrete
• Masonry
• Fiber Cement
• Vinyl
• EPDM
• Aged Acrylic Coatings
• Granular Cap Sheet
• Wood
• Metal
• And more!