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Insulating Foams


Each GREAT STUFF™ Insulating Foam Sealant is specially formulated to seal gaps and cracks to block air, moisture, and even pests — making it perfect for any of your project needs. Our comprehensive line of ready-to-use sealants is a simple, inexpensive money-saving solution.

We offer two series – GREAT STUFF™ products for the homeowner, applied with the SMART DISPENSER™ and the GREAT STUFF PRO™ Series, designed for the professional contractor that features precision application, no-drip dispensing, and restart ability for up to 30 days.



This series of videos gives you a first hand look at how to use Lentus products properly and gives you tips to get the most out of the tools you use. 

00341553 GS GAPS CRACKS Smart Dispenser

​GREAT STUFF Gaps & Cracks is a polyurethane-based insulating foam sealant that fills, air-seals and insulates small gaps (less than 1 inch) inside or out.

  • Forms a permanent weather-tight seal to minimize drafts and insect infestation

  • Exceptional adhesion to building materials

  • Interior or exterior use

  • Tack free in 6 minutes; Trims in 30 minutes

  • Foam elasticity allows for movement/shifting within a structure

  • Paintable, stainable and sandable

  • Cream colored foam

  • Cures rigid

  • All-direction dispensing

  • UL Classified

  • ​Available in 12- and 16-oz. cans

GREAT STUFF Gaps & Cracks

​GREAT STUFF Fireblock impedes the spread of fire and smoke through service penetrations. The foam has an identifiable orange color and can be delivered through stud walls. This Great Stuff insulating foam sealant can be used both indoors and outdoors so your whole property is covered.

  • Application temp. range: 40 degrees to 100 degrees F

  • Expansion ratio: 2-4:1

  • Standards: UL classified

  • Substrates: wood, glass, metal, masonry, most plastics

  • Application: fire barrier

  • Cures in 8 hours

  • Indoor, outdoor

  • Insulation value: R-3.7

Have a question about a particular product or application?  Leverage the knowledge of our product experts and they'll get back to you with the information you need.

00197711 GS  Window & Door W Smart Dispe

​GREAT STUFF Window & Door forms a durable, airtight and water-resistant seal that can help lower energy bills. One can will fill an average of four to six residential windows.

  • Soft, pliable and can be stuffed into the gap if overfilled

  • Tack free in 5-15 minutes

  • Ready to trim within 60 minutes

  • Includes: Dispensing Straw

  • Cut, sand, paint, stain

  • Yellow in color

GREAT STUFF Windows & Doors
GREAT STUFF Multipurpose Black

​GREAT STUFF Multipurpose Black fills unwanted gaps and cracks, can be used across multiple applications, and blends into the surrounding environment.

  • Black in color, blending naturally into the surrounding environment

  • Multipurpose in function, for both interior and exterior use

  • Fills, seals and insulates gaps up to 3/4 of an inch

  • Allows cured foam to hide well and not be noticeable in shadows

  • Simple, inexpensive way to minimize air flow and reduce condensation in a variety of applications


​GREAT STUFF Pestblock is specifically designed to block insects and pests from entering the home. This insulating foam sealant expands to fill, seal and insulate the gaps, cracks and holes where they commonly enter.

  • Blocks critters, bugs and other pests from your home

  • Contains no pesticides

  • Won't harm bees

  • Forms a water-resistant, airtight seal.

  • Seals gaps and cracks up to 1" (25 mm)

  • Helps improve energy efficiency and lower utility bills.

  • Bonds with most building materials and surfaces

  • Indoor & outdoor use

  • Available in 12- and 16-oz. cans


​GREAT STUFF Pond & Stone is specifically designed to help quickly and easily build beautiful water features. This polyurethane foam expands to fill gaps and cracks to help direct water to flow over the rocks in a waterfall, rather than under and in between.

  • Black in color to blend in with stones and shadows

  • Bonds without mortar

  • Helps direct water over, not under, rocks

  • Creates a water-shedding bond for stone, rock, masonry, concrete and other building materials

  • Safe for ornamental fish and plants

  • Lasts for years in wet conditions

  • Can be applied to damp and dry surfaces

  • Cures in 8 hours


When you need a heavy-duty adhesive, premium-grade GREAT STUFF PRO™ Wall & Floor is up to the task. It’s a single-component, moisture-cured foam adhesive.

  • Seals subfloors, drywall, paneling, foam panels and most construction materials

  • Provides a fast-grab tack and long-term bond to lumber, plywood, particle board, masonry, drywall, concrete and foam panels

  • Works on dry, damp and frozen lumber

  • Goes on with a foam-dispensing gun for greater precision and access to hard-to-reach places

  • Comes in a can that’s reusable for up to 30 days, minimizing waste

  • Is available in 26.5-oz. (751 g) cans

GREAT STUFF Wall & Floor
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