Dap Inc 18420 Dynaflex Elastomeric Latex Sealant 10.1 Oz

Product Description

The DAP INC 18420 is a premium elastomeric latex sealant in the Dynaflex line, formulated for professionals who need a long-lasting, weatherproof seal in demanding interior and exterior applications. This 10.1-ounce cartridge delivers a flexible, durable bead that resists cracking, shrinking, and mildew over time. The bronze color blends naturally with common architectural finishes. Low odor and water cleanup make it practical for occupied spaces, while its elastomeric formula accommodates substrate movement without compromising the seal. Rated for 50 years of durability, it meets TT-S-00230C Type II and ASTM C 920 Class 25 standards.

This sealant is suited for residential and commercial applications where a reliable, paintable seal is required around windows, doors, trim, siding, flashing, and other building envelope penetrations. It performs across a wide range of substrates common in construction and renovation work, including wood, masonry, and metal. Plumbers, HVAC technicians, and general contractors use elastomeric latex sealants like this one to seal interior and exterior joints where both flexibility and weather resistance are priorities.

Key Features

• 50-year durability rating for long-term seal integrity
• Elastomeric formula remains flexible to accommodate joint movement
• Paintable surface accepts most latex and oil-based topcoats
• Low odor formulation suitable for occupied or enclosed spaces
• Mildew resistant for wet or high-humidity environments
• Water cleanup before cure — no solvents required
• Meets TT-S-00230C Type II and ASTM C 920 Class 25 standards

Compatibility

Designed for interior and exterior sealing applications on common construction substrates including wood, masonry, and metal surfaces where a paintable, watertight elastomeric seal is required.

Installation Notes

Apply with a standard caulk gun to a clean, dry, and frost-free surface. Remove old sealant and loose material before application for proper adhesion. Tool the bead immediately after application and allow adequate cure time before painting or exposing to moisture. Clean hands and tools with water before the sealant cures.