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Standard caulk tube in clay colour with DYNAFLEX 920 branding

D.A.P.

D.A.P. DYNAFLEX 920 Elastomeric Exterior Sealant 10.1 fl oz Clay CL512

SKU CH-SE8E-ZHFS7

Elastomeric exterior sealant for siding and windows that stays flexible, resists cracking, and applies on damp surfaces down to 20 degrees Fahrenheit

  • Product typePutties
  • Conforms to ASTM C920 Class 25 for proven joint performance
  • Applies on damp or wet surfaces without wash-out during cure
  • Remains flexible down to 20 °F preventing cold-weather cracking
  • Paintable after 7 to 14 days for finished appearance
  • Solvent-based elastomeric formula delivers waterproof weatherproof exterior seal

DYNAFLEX 920 Elastomeric Sealant

The DAP DYNAFLEX 920 is a solvent-based, high-performance elastomeric sealant supplied in a 10.1 fl oz cartridge. It is designed for professional installation of siding and windows where a long-lasting, flexible seal against air and water intrusion is required. The clay CL512 colour provides an aesthetically pleasing finish for exterior applications.

Suited for damp, cold or moving joints

This product suits installers who must seal joints on wet or damp surfaces and need application capability down to 20 Fahrenheit. It conforms to ASTM C920 Class 25 requirements, remaining crackproof, waterproof and weatherproof under extreme movement. Buyers who need a non-paintable sealant or a cure time shorter than 7 to 14 days should look at something else.

Cartridge use and cure considerations

The sealant loads into a standard caulk gun after cutting the nozzle for a minimum ¼ bead and bursting the internal foil seal. It self-tools for a smooth finish and will not wash out if rain occurs during the cure period. Wet cleanup requires mineral spirits on tools and surfaces only, while dried excess must be scraped or cut away. Full paintability is achieved after the sealant dries through completely.

How it compares

Measured against everything we stock in Caulking & Sealing Supplies, at today’s prices. Recalculated every night.

Price $15.99
Typical for this category: the median of 631 items is $16.99.

Specifications

Product
Product typePutties

Questions about this item

What caulk gun do I need for the 10.1 fl oz cartridge?

A standard 10.1 fl oz caulk gun accepts this cartridge. Load it, then apply pressure to burst the internal foil seal before dispensing.

Can I apply DYNAFLEX 920 over old cured sealant that I leave in place?

Remove loose or deteriorated material first. The new elastomeric bead bonds best to clean, sound substrates; it is not designed to adhere reliably over old cured sealant.

How do I confirm the seal is performing after the 7 to 14 day cure?

After full cure the bead stays flexible, resists cracking when the joint moves, repels water, and accepts paint without adhesion loss — all signs the ASTM C920 Class 25 seal is working.

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