Arm yourself against the elements with OSI QUAD Window, Door & Siding Sealant. OSI QUAD Window, Door & Siding Sealant (1638674) is an all-season formula designed for superior caulking performance on exterior window, door and siding applications, fiber-cement and vinyl siding, PVC trim, and much more. It can be applied to wet or dry surfaces, even at freezing temperatures and, unlike other sealants, it resists dirt and dust collection, yellowing and water washout. OSI QUAD bonds without a primer to most common substrates like cedar, painted or stained woods, fiberglass, vinyl, coated aluminum, steel, metal, brick, masonry and concrete. With resistance to UV and extreme temperatures (20°F to 120°F) and proven wet surface application, OSI QUAD is the versatile and durable choice for professional contractors. OSI QUAD is self-tooling and once cured is paintable with latex paints. Our color specialists work closely with leading window, door and siding manufacturers to ensure perfect color matches. OSI QUAD is composed of elastomeric polymers and high quality synthetic resins. OSI offers an arsenal of adhesives, caulks, and outdoor construction sealants for the true professional. OSI: Tougher Than the Elements.
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Individual size (oz.)
Coverage (linear ft.)
Cure Time (hours)
Dry Color Family
Dry to touch (min.)
Fire and High Heat Resistant,Moisture Resistant,Paintable,Permanently Flexible
Number of Tubes Included
Warranty / Certifications
Certifications and Listings
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out of 1,111 reviews
85%recommend this product
Showing 1-10 of 1,111 reviews
Jun 25, 2022
Tube split and ruined caulk gun.
Had a tube split and thought it was because it was old caulk. Bought two new tubes and started to apply in dry, 80 degree weather. First tube split the length and filled gun with sealant. Spent more time cleaning gun than job should have taken and still have to replace the caulk gun, rod bent and barely advances even at high speed setting. Where do I send the bill for reimbursement? Have applied hundreds of feet of different caulks without any problems until this caulk.
Response from OSI - Henkel CorporationJun 27, 2022
We're so sorry you had this experience with our product. What you described isn't characteristic of OSI QUAD when the nozzle opening is cut large enough and the inner foil seal has been properly punctured. If you ever need assistance with our products, feel free to reach out to our team at 1-800-624-7767.
Apr 22, 2022
Good product but messy.
After I had a 2nd tube burst/leak I decided to leave a review.
Response from OSI - Henkel CorporationJun 23, 2022
Thank you for choosing OSI for your project. If you ever need help using our product, feel free to reach us at 1-800-624-7767.
Sep 21, 2021
It is of very good quality
Response from OSI - Henkel CorporationSep 22, 2021
Thank you for taking time to post your feedback. We are glad that OSI QUAD Sealant was up to your standards. Please let us know if we can ever be of assistance. -The Henkel/OSI Team, 1800-624-776
Jun 18, 2019
I've had this in place for about 2 weeks. This was recommended by a high end window installer wit...
I've had this in place for about 2 weeks. This was recommended by a high end window installer with the highest recommendations. I'd rather pay a little more and get better lifetime coverage, than to keep reapplying every few years. This is really tough stuff and awesome to apply. Does not shrink or peel, which is very important to say the least. Another good feature is that it has a self puncturing seal, so you don't have to insert a tool to puncture the seal initially. I'd recommend wearing vinyl gloves, once this dries on your hands it's very tough to get off.
4 found this review helpful
Oct 31, 2018
I used it to install glass trim around some time together it is easy to work with and bonded inst...
I used it to install glass trim around some time together it is easy to work with and bonded instantly. Great product!
2 found this review helpful
Sep 4, 2018
The sealant was very effective and flowed from the tube very evenly. I provided the coverage tha...
The sealant was very effective and flowed from the tube very evenly. I provided the coverage that I needed. I would chose this brand again for future projects.
1 found this review helpful
Dec 14, 2017
Very viscous consistency straight out of the tube. At first I thought I had purchased some old ca...
Very viscous consistency straight out of the tube. At first I thought I had purchased some old caulk but after reading other reviews I believe this product is just normally very stiff. I bought this for sealing under the mounting flanges of new windows but it is so stiff that it causes the flange to buckle between nails. Pushing on the flange helps the caulk to spread but I still ended up with a "wavy" flange. It probably would work great for applications where compression isn't necessary. It cures to a flexible, rubbery seal.
4 found this review helpful
Dec 29, 2016
Used this to seal around some stained wood. The color is definitely not brown but more grey. As a...
Used this to seal around some stained wood. The color is definitely not brown but more grey. As a sealant it's great, but the color is not as advertised.
7 found this review helpful
Oct 4, 2016
Very good caulking
Excellent product. Make sure you allow plenty of cure time before you want to paint, minimum required is 7 days. Use mineral spirits to clean up, the only thing that works.