Legacy Pro sealants are positioned by product technology, ASTM classification, movement capability, and intended application category.

Comparisons are based on publicly available Technical Data Sheets (TDS) and are designed to help contractors identify the appropriate product type for their project — not to claim chemical equivalence or brand substitution.

For detailed brand-to-brand comparisons, use our “Compare Your Brand” tool.

HP1 – All-Purpose Neutral-Cure 100% Silicone
(ASTM C920 Type S, Grade NS, Class 50)

HP1 aligns with high-performance, neutral-cure 100% silicone sealants used for interior and exterior general construction joints, including kitchens, baths, windows, and door perimeters.

Comparable category:
All-purpose, neutral-cure Class 50 silicone sealants.

HP2 – Interior Neutral-Cure 100% Silicone
(ASTM C920 Type S, Grade NS, Class 50)

HP2 aligns with interior kitchen & bath 100% silicone sealants formulated for permanent, waterproof sealing in wet-area environments.

Comparable category:
Interior, neutral-cure Class 50 silicone sealants.

HP3 – Exterior Acetoxy-Cure 100% Silicone
(ASTM C920 Type S, Grade NS, Class 50, Use G & O)

HP3 aligns with exterior glazing-grade silicone sealants used for glass-to-glass, glass-to-metal, storefront, and curtainwall perimeter applications.

Comparable category:
Exterior glazing silicones rated for Class 50 movement and Use G & O under ASTM C920.

HP4 – Exterior Hybrid Polymer Construction Sealant
(ASTM C920 Type S, Grade NS, Class 50)

HP4 aligns with high-performance hybrid polymer (SMP/MS) construction sealants used for siding, trim, window perimeters, masonry interfaces, flashing details, and general exterior construction joints.

Comparable category:
Class 50 hybrid polymer (SMP/MS) or high-performance polyurethane construction sealants used in exterior building envelope applications.