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A 10.1 fl oz clay-coloured cartridge of Dynaflex 920 elastomeric exterior sealant

D.A.P.

D.A.P. DYNAFLEX 920 Elastomeric Exterior Sealant 10.1 fl oz Clay CL500

SKU CH-NN0T-TZXEG

Elastomeric exterior sealant conforms to ASTM C920 Class 25, applies at 20°F, and resists cracking on damp surfaces

  • TypePutties
  • Meets ASTM C920 Class 25 standard for durable elastomeric performance
  • Applies on damp or wet surfaces without washing out in rain
  • Functions in temperatures as low as 20 Fahrenheit for cold-weather jobs
  • Extremely flexible seal resists cracking under structural movement
  • Paintable after 7 to 14 days cure for finished appearance

Professional exterior elastomeric sealant

The DAP DYNAFLEX 920 is a solvent-based, high-performance elastomeric sealant designed for professional installation of siding and windows. It provides a long-lasting elastomeric seal that helps prevent air and water intrusions. Suitable for exterior use, it adapts to surfaces that are damp or wet. Builders needing interior-only caulk should look elsewhere.

Sustained weather and movement resistance

The sealant conforms to ASTM C920, Class 25 requirements, maintaining flexibility without cracking under pressure. It works at temperatures as low as 20 Fahrenheit and will not wash out when exposed to rain during the cure period. The cured seal remains crackproof, waterproof, and weatherproof over time. Projects requiring non-paintable or rigid fillers are not a fit.

Paintable after full cure window

The product becomes paintable after fully drying through, which takes 7 to 14 days depending on conditions. It is self-tooling for a smooth finish and cleans up with mineral spirits while wet. Clay CL500 is one of a wide variety of available shades. Buyers needing immediate paint readiness or a different colour match must select another option.

Highlights

  • Meets ASTM C920 Class 25 standard for durable elastomeric performance
  • Applies on damp or wet surfaces without washing out in rain
  • Functions in temperatures as low as 20 Fahrenheit for cold-weather jobs
  • Extremely flexible seal resists cracking under structural movement
  • Paintable after 7 to 14 days cure for finished appearance

Specifications

TypePutties

Questions about this item

Does the 920 sealant stay flexible in sustained heat or cold once cured?

It remains extremely flexible and crackproof after curing, meeting ASTM C920 Class 25 movement requirements even through temperature swings.

What tools and surface prep are needed before applying the 10.1 fl oz cartridge?

A standard caulk gun is required; cut the nozzle for at least a ¼ bead, burst the foil seal, and apply to damp or dry surfaces — no primer needed.

Can I apply the Clay CL500 over older solvent-based caulk that is still in place?

Yes, it bonds to cured sealants; clean the old bead with mineral spirits, let it dry, then tool the new 920 sealant for a continuous weatherproof joint.

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