Top 10 Best urethane adhesive in 2026

Last Updated - 6/28/2026

🏆Best Choice

SIKA

SIKA Sikaflex-221 Multi-Purpose Sealant/Adhesive, Gray, 10.1 fl. oz – Fast-Curing Polyurethane, Highly Elastic, Weather-Resistant, Sandable & Paintable, Bonds to Wood, Metal, and Plastics

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•VERSATILITY AND QUALITY IN ONE - Sometimes simply called Sika 221 aluminum gray, this one-component urethane caulk bonds to a range of substrates, including metals, plastics, and metal primers and coatings
•AGE RESISTANT - Formulated to resist the effects of aging to better perform at peak capacity no matter the conditions. Also resists elements such as seawater, diluted acids, and caustic solutions
•READY TO USE - The Sikaflex 221 gray sealant comes in a handy cartridge that fits easily on an electric, pneumatic, or manual application gun, making accurate placement of adhesive paste quick and easy
•SAFE AND EFFECTIVE - Approved by the NSF for use in both drinking water systems and food production operations, so you can rest easy knowing there's no harmful level of chemicals
•PERFECT FOR INTERNAL SEALS AND BONDING - Use it for permanent seals that you can rely on. The paste also bonds to ceramic materials and cures quickly upon exposure to atmospheric moisture

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$13.00

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AWF PRO

Sikaflex 1a Kit - One Component, Flexible, Non Sag, Polyurethane Concrete and Masonry Sealant for Vertical and Horizontal Surfaces, Sikaflex 1a 10 oz (White, Pack of 12)

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•HIGH PERFORMANCE! Sikaflex 1a is a premium grade, high performance, moisture cured, one component, polyurethane based, non sag elastomeric sealant. Sikaflex 1a has excellent adhesion and bonds to most construction materials without a primer. It has resistance to aging and weathering and can be used in green and damp concrete applications.
•HIGH ELASTICITY! Sikaflex 1A cures to a tough, durable and flexible consistency: +/- 35% movement. Sikaflex 1A is extremely elastic and durable and will resist aging and weathering.
•GREAT COVERAGE! Sikaflex 1a is designed for all types of joints where the maximum depth of sealant will not exceed 1/2 in. It is ideal for small joints and fillets, windows, door frames, reglets, flashing, common roofing detail applications, and many construction adhesive applications. Sikaflex 1a is also jet fuel resistant and is able to be used in submerged conditions, such as canal and reservoir joints.
•TESTED AND APPROVED! Meets Federal Specification TT-S-00230C, Type II, Class A. Meets ASTM C-920, Type S, Grade NS, Class 35, use T, NT, O, M, G, I, A. Canadian standard CAN/CGSB 19.13-M87.

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$89.00

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AWF PRO

Sikaflex 1a Kit - One Component, Flexible, Non Sag, Polyurethane Concrete and Masonry Sealant for Vertical and Horizontal Surfaces, Sikaflex 1a 10 oz (Limestone, Pack of 12)

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•HIGH PERFORMANCE! Sikaflex 1a is a premium grade, high performance, moisture cured, one component, polyurethane based, non sag elastomeric sealant. Sikaflex 1a has excellent adhesion and bonds to most construction materials without a primer. It has resistance to aging and weathering and can be used in green and damp concrete applications.
•HIGH ELASTICITY! Sikaflex 1A cures to a tough, durable and flexible consistency: +/- 35% movement. Sikaflex 1A is extremely elastic and durable and will resist aging and weathering.
•GREAT COVERAGE! Sikaflex 1a is designed for all types of joints where the maximum depth of sealant will not exceed 1/2 in. It is ideal for small joints and fillets, windows, door frames, reglets, flashing, common roofing detail applications, and many construction adhesive applications. Sikaflex 1a is also jet fuel resistant and is able to be used in submerged conditions, such as canal and reservoir joints.
•TESTED AND APPROVED! Meets Federal Specification TT-S-00230C, Type II, Class A. Meets ASTM C-920, Type S, Grade NS, Class 35, use T, NT, O, M, G, I, A. Canadian standard CAN/CGSB 19.13-M87.

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$89.00

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AWF PRO

Sikaflex 1a Kit - One Component, Flexible, Non Sag, Polyurethane Concrete and Masonry Sealant for Vertical and Horizontal Surfaces, Sikaflex 1a 10 oz (Aluminum Gray, Pack of 12)

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•HIGH PERFORMANCE! Sikaflex 1a is a premium grade, high performance, moisture cured, one component, polyurethane based, non sag elastomeric sealant. Sikaflex 1a has excellent adhesion and bonds to most construction materials without a primer. It has resistance to aging and weathering and can be used in green and damp concrete applications.
•HIGH ELASTICITY! Sikaflex 1A cures to a tough, durable and flexible consistency: +/- 35% movement. Sikaflex 1A is extremely elastic and durable and will resist aging and weathering.
•GREAT COVERAGE! Sikaflex 1a is designed for all types of joints where the maximum depth of sealant will not exceed 1/2 in. It is ideal for small joints and fillets, windows, door frames, reglets, flashing, common roofing detail applications, and many construction adhesive applications. Sikaflex 1a is also jet fuel resistant and is able to be used in submerged conditions, such as canal and reservoir joints.
•TESTED AND APPROVED! Meets Federal Specification TT-S-00230C, Type II, Class A. Meets ASTM C-920, Type S, Grade NS, Class 35, use T, NT, O, M, G, I, A. Canadian standard CAN/CGSB 19.13-M87.

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$89.00

$93.29

-5%

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SIKA

SIKA Sikaflex-1A Joint Sealant, Limestone, for Green and Damp Concrete, Premium Polyurethane Adhesive for Joints, Fast Cure, 10.1 fl. oz Cartridge

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•IDEAL CHOICE FOR SMALL JOINTS — Offers exceptional performance on joints where maximum depth is equal to 1/2-in. or less. Use to secure windows, door frames, reglets, flashing, and more
•FIGHTS WEATHERING AND AGING — The urethane-based formula offers strong resistance to weathering and aging. Cures quickly to a tough but pliant consistency that lasts
•HIGH ELASTICITY FOR BETTER PERFORMANCE — This limestone caulk maintains an impressive elasticity for better resistance to tears and cuts. Can accommodate ±35% joint movement without damage
•CERTIFIED AND RELIABLE — Meets multiple federal and Canadian standards, including ASTM C920 for elastomeric joint sealants and NSF/ANSI Standard 61 for potable water
•SAVES TIME — Your fast-curing Sikaflex pro select sealant provides you with a tack-free time to touch of only 3 hours and a final cure of a week or less

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$13.20

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SIKA

SIKA Sikaflex-1a Sealant, 10.1 fl oz, White – Premium Adhesive for Small Joints, Weather & Age Resistant, High Elasticity, Ideal for Windows, Door Frames & More

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•IDEAL CHOICE FOR SMALL JOINTS — Offers exceptional performance on joints where maximum depth is equal to 1/2-in. or less. Use to secure windows, door frames, reglets, flashing, and more
•FIGHTS WEATHERING AND AGING — The urethane-based formula offers strong resistance to weathering and aging. Cures quickly to a tough but pliant consistency that lasts
•HIGH ELASTICITY FOR BETTER PERFORMANCE — This limestone caulk maintains an impressive elasticity for better resistance to tears and cuts. Can accommodate ±35% joint movement without damage
•CERTIFIED AND RELIABLE — Meets multiple federal and Canadian standards, including ASTM C920 for elastomeric joint sealants and NSF/ANSI Standard 61 for potable water
•SAVES TIME — Your fast-curing Sikaflex pro select sealant provides you with a tack-free time to touch of only 3 hours and a final cure of a week or less

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$13.50

$14.66

-8%

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AWF PRO

Sikaflex 1a 20 oz Sausage with AWF PRO Gloves – Limestone, Pack of 10 – Non Sag, Polyurethane Concrete and Masonry Joint Sealant for Vertical and Horizontal Joints

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Primerless Application: Excellent adhesion and bonds to most construction materials without requiring a primer
•Damp Surface Compatible: Resistant to aging and weathering; can be applied to green or damp concrete
•Flexible and Durable: Cures to a tough, flexible seal with ±35% movement capability Depth-Limited Design: Formulated for joints where sealant depth does not exceed 1/2 inch
•Application Versatility: Ideal for small joints and fillets; windows; door frames; reglets; flashing; common roofing detail applications; and many construction adhesive applications
•Specification Compliant: Meets TT-S-00230C, Type II, Class A and ASTM C920, Type S, Grade NS, Class 35, and Canadian standard CAN/CGSB 19.13-M87

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$137.99

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Sikaflex

Sikaflex 1A Polyurethane Premium Grade High Performance Elastomeric Sealant, 10.1 fl oz Capacity, Black

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Eliminates time, effort, and equipment for mixing, filling cartridges, pre-heating or thawing, and cleaning of equipment.
•Designed for all types of joints where maximum depth of sealant will not exceed 1/2 in.
•Excellent for small joints and fillets, windows, door frames, reglets, flashing, common roofing detail applications, and many construction adhesive applications.
•Suitable for vertical and horizontal joints; readily placeable at 40°F.
•Submerged conditions, such as canal and reservoir joints.

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$14.29

$15.40

-7%

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SIKA

Sikaflex 1A 91012, Capitol Tan, One Part Polyurethane Elastomeric Sealant, 300ml Cartridge

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Fast tack-free and final cure times.
•Excellent resistance to aging, weathering.
•Excellent adhesion - bonds to most construction materials without a primer.
•High elasticity - cures to a tough, durable, flexible consistency with exceptional cut and tear-resistance.
•Eliminates time, effort, and equipment for mixing, filling cartridges, pre-heating or thawing, and cleaning of equipment.

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$15.00

$16.00

-6%

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Sikaflex

SIKAFLEX 1A WHITE

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•12 - 10.1 oz Tubes
•Color: White
•Material: Polyurethane Sealant
•1/4" bead will yield 24 ft. of sealant
•3/8" bead will yield 11 ft. of sealant

View offer on:

$89.00

$93.29

-5%

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