Expanding Foam Sealant in Convenient Aerosol 1474

Product Description

EXPANDO is a one-component liquid polyurethane foam which yields 220 lineal feet of 3/8” bead. It sprays as a liquid then cures to a durable, semirigid closed cell foam insulation. The cured foam can be trimmed with a sharp knife or sanded. Dries tack free in 10 minutes, fully expanded in one hour and cures in 8-24 hours, depending on humidity. Product will expand to 2 to 3 times sprayed volume. Hence, test before using and do not fill cavity completely. Cured foam is resistant to heat and cold, -200°F to +200°F, and to aging, but not UV rays unless painted, covered or coated. Forms a water-resistant, weather-resistant, and airtight bond on masonry, wood, metal, glass, tile, and most plastics.

Product Features

  • Fills, seals, plugs, bonds and insulates
  • Conforms to any shape
  • Expands 200-300%
  • 1 inch thickness yields R-5 insulation factor
  • Seals against heat or cool air loss, pests, dirt, drafts and sound
  • Dampens sound noise in autos and vans
  • Contains a flame-retardant
  • Helps cut energy costs


  • Boats
  • RV’s
  • Refrigeration
  • Plumbing
  • Electrical Equipment
  • Air Conditioners
  • Windows and Doors
  • Masonry
  • Appliances
  • Carpentry
  • Vents and Heating Ducts
  • Auto and Truck Doors

Directions for Use

Use only when container is between 65°F and 85°F. Can must be at room temperature for several hours prior to use. Protect surrounding area with dropcloth or newspaper. Clean surface to remove loose dirt, debris, oil, or grease.

Shake can vigorously for one minute prior to use. Press extension tube firmly onto plastic trigger actuator. Screw trigger/tube assembly onto valve stem, being careful not to actuate valve. Foam expands 2 to 3 times in size. Test in an experimental area prior to use.  Invert can and press trigger slowly.  Fill cavity only 40% as foam will expand 200-300%.


This product contains a flammable propellant and should not be used around ignition sources such as open flames, energized electrical circuits or while smoking, until the cure process is complete.

Once cured, the sealant is nonflammable and will slow flame spread during a structure fire.

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