HP3 100% Silicone Exterior Sealant (Acetoxy Cure)

Why Pros Choose HP3

Fast-curing, professional-grade silicone engineered for exterior glazing and exposed outdoor joints.
HP3’s acetoxy-cure chemistry delivers rapid skin formation, excellent UV resistance, and strong adhesion to glass, aluminum, coated metals, and other smooth, non-porous substrates. Designed specifically for glass-to-glass, glass-to-metal, storefront, curtainwall, and skylight applications, HP3 provides long-term weatherproofing in demanding outdoor conditions.

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Key Benefits

• Acetoxy cure = fast skin & fast cure for efficient exterior installs
• Exceptional adhesion to glass, coated metals, and smooth non-porous surfaces
• Superior UV & weather resistance for long-term outdoor durability
• Excellent flexibility maintains performance in movement and temperature extremes
• Mold- and mildew-resistant
• Non-paintable (apply paint before sealing)
• Non-corrosive to most common glazing metals

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Primary Exterior Applications

• Glass-to-glass joints
• Glass-to-aluminum or glass-to-coated-metal transitions
• Storefront glazing
• Curtainwall joints
• Skylight perimeter sealing
• Exterior window repairs
• Outdoor tile, ceramic & smooth-surface sealing

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Additional Suitable Uses

• Siding or trim touch-ups on smooth, coated surfaces
• Exterior repairs where acetoxy silicone is acceptable
• Perimeter sealing of metal frames

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Directional Recommendations

• For exterior siding, field installation, or high-movement joints → use HP4 Hybrid Polymer
• For interior kitchens, baths, and general-purpose non-porous sealing → use HP2 Neutral-Cure Silicone
• For compact all-purpose silicone → use HP1 2.8oz Silicone

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Color Availability

Clear (HP3000)
White (HP3001)
Custom colors available.
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Packaging

10.1 fl oz cartridge (Standard caulk gun)
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Limitations

• Not for natural stone (may stain)
• Not for porous masonry (brick, stone, concrete)
• Not recommended on copper, brass, galvanized steel
• Not for continuous water immersion
• Non-paintable
• Apply only to dry, clean surfaces