
Ratings & Reviews for OSI GS121 10-oz Exterior and Specialty Clear Paintable Solvent Self Leveling Caulk
Ratings may include incentivized customer reviews.
What Customers Are Saying
The product is a high-quality sealant that effectively seals leaks in gutters, downspouts, and other areas. It remains flexible and durable even in harsh weather conditions. The sealant has a self-leveling consistency that makes it easy to apply, but some users found it can be messy to work with and requires careful surface preparation. Overall, most reviewers were satisfied with the product's performance and would recommend it for home repair projects.
Customer review summary generated by AI, including incentivized reviews.Not worth the money
Would Not RecommendI tried to use this on my gutter and it stuck better to my gloves than to the gutter. I don’t think I even got any on the gutter.
Verified Purchaser
Thank you for sharing this feedback. We are so sorry to hear about your experience with the OSI GS121 Clear Gutter Sealant. What is being described i...

Wow
Would Recommend[This review was collected as part of a promotion.] I can't say enough about this product. Wow, so glad I bought it. I couldn't be more satisfied. It has definitely met each and everyone of my expectations.
From OSI
We are pleased to hear that you are satisfied with your experience using our product.
Gutter seal
Would RecommendIt works, what else do you need to know! It’s clear.
From GS121 5-oz Exterior and Specialty Clear Paintable Solvent Self Leveling Caulk Verified Purchaser
very gooey
Would Not RecommendEither I do not know how to use this or it was defective. I squeezed it out around gutter pipe connection but it did not hold in place. kept dripping down. I had to tie pipe in place and wait two days for it to dry. I am hoping it keeps the water from dripping around spout.
Verified Purchaser
Thank you for sharing your feedback. The GS 121 Clear should not be dripping unless large amounts were used over head or temperatures were very warm ...
Thank you for sharing your feedback. What you have described is not characteristic of the product. The GS 121 Clear should not be dripping unless la...

OSI GS121 10-fl oz Clear Synthetic Polymer Gutter
Would Not RecommendDifficult to work with. Does not stick to what you are attempting to apply it to. Ultimately had to use another product to fix the problem.
Verified Purchaser
Thank you for sharing this feedback. We are so sorry to hear about your experience with the OSI GS 121 Gutter Sealant. What is being described is not...

Thank you for sharing this feedback. We are so sorry to hear about your experience with the OSI GS 121 Gutter Sealant. What is being described is not...
Think this will do exactly what I needed
Would RecommendI used this to stop a gutter drip that was causing mold on my stone wall. It was clear and does not show. Be sure and wear some latex gloves. it makes the personal cleanup a lot easier.
From GS121 5-oz Exterior and Specialty Clear Paintable Solvent Self Leveling Caulk Verified Purchaser
Great Product
Would Recommend[This review was collected as part of a promotion.] This is a great product and worked as it was supposed to. I had two gutters that needed their end caps sealed because the water was dripping through. On a rain-free day I thoroughly cleaned the surfaces, applied the products, and voila the leak was fixed
From OSI
We are pleased to hear that you are satisfied with your experience using our product.
Good durable caulking
Would Recommend[This review was collected as part of a promotion.] The GS121 Clear is a good durable caulk to use around the house. I used it on my windows and it is holding up nice. The caulking is durable and easy to work with and is strong enough for my uses.
From OSI
We are pleased to hear that you are satisfied with your experience using our product.
The Best
Would RecommendEasy to use and durable. I like the smaller tube because I can carry it in my tool pouch for quick use on a ladder.
From GS121 5-oz Exterior and Specialty Clear Paintable Solvent Self Leveling Caulk
Clear sealant
Would Recommend[This review was collected as part of a promotion.] Love how it is a clear sealant that turns into a rubbery sealant. It’s flexible and water resistant. It seals around most common gutters, aluminum, downspout materials, and many more. It expands and contracts with temperature changes.
From OSI
We are pleased to hear that you are satisfied with your experience using our product.
Great product
Would Recommend[This review was collected as part of a promotion.] I bought this because my gutters had some leaks here an there and I've tried other products but they just didnt hold up so I decided to try this must say highly impressed very durable I would recommend this product to anyone who needs a simple fix for gutters etc
From OSI
We're thrilled to hear that our product has been able to meet your needs and that you are happy with its performance.
Great sealant
Would Recommend[This review was collected as part of a promotion.] I bought this product a month ago and it works great, used it on windows and doors, perfect strength for the job, very easy to clean up the over flow. Definitely recommend this product for house hold used.
From OSI
We're thrilled to hear that our product has been able to meet your needs and that you are happy with its performance.
Works Perfect
Would Recommend[This review was collected as part of a promotion.] We recently bought a house and after moving in got a pretty big winter storm. The next day the sun was out and everything was melting. My gutters were leaking everywhere and this helped stop the problem until they can be replace. This product worked in a time of need.
From OSI
We're thrilled to hear that our product has been able to meet your needs and that you are happy with its performance.
Not Worth The Money
Would Not RecommendWe bought this product and applied it to our leaking vinyl gutters after cleaning the area well and wiping with alcohol. The product was difficult to work with but we did get it placed. The next morning our gutters were leaking just from the dew. We took the product back to Lowe's for a full refund. Don't waster your money.
Thank you for sharing your feedback. We are sorry to hear about your experience. What you described is not characteristic of this product. If this wa...
Thank you for sharing your feedback. We are sorry to hear about your experience. What you described is not characteristic of this product. If this wa...

Great fix
Would Recommend[This review was collected as part of a promotion.] My gutter was leaking at a few seams and didn't have the money to replace them so I found this for a great fix quick and easy no mess and it works great and saved me hundreds of dollars in repairs
From OSI
We appreciate your positive feedback and are pleased to know that you are satisfied with our product.
works great for my gutters
Would Recommend[This review was collected as part of a promotion.] This GS121 Clear caulk from OSI worked really well when I used it to seal up the gutters on my garage. It went on smooth and I was able to complete the whole perimeter of the gutters on my detached one car garage. Its held up perfectly through the rainy and snowy weather we've been having in WA and I wish I would have used this sooner!
From OSI
We appreciate your positive feedback and are pleased to know that you are satisfied with our product.
Fixed the leak!
Would Recommend[This review was collected as part of a promotion.] Had some leakage around a couple of spots in the gutters around the house. Spread a bit of this around the leaking area, and the leak stopped! I can say this product definitely did the trick... Been solid for several weeks so far, even with heavy rain...
From OSI
We appreciate your positive feedback and are pleased to know that you are satisfied with our product.
Excellent gutter seal
Would Recommend[This review was collected as part of a promotion.] This OSI GS121 gutter sealant worked great. Application was easy as planned with a standard caulk gun. It adhered well to the metal gutter. Several heavy rain storms later and everything is still sealed tight. I'd recommend
From OSI
We appreciate your positive feedback and are pleased to know that you are satisfied with our product.
Works great
Would Recommend[This review was collected as part of a promotion.] Got this to repair some leaking spots around trim on our mobile home and gutters on out building. This seals very nice and drys clear so it is virtually unnoticeable after drying. Comea out easily from the caulk gun, but you can also use a putty knife and spread it for multiple uses. It really helped fix a few problem areas that we had, a great product at a good price.
From OSI
We appreciate your positive feedback and are pleased to know that you are satisfied with our product.
Nice hold
Would Recommend[This review was collected as part of a promotion.] I have gutters most of the way around the house and have had a little leaks on the down spouts. I got this caulk to seal the connections for the down spouts. It is working great! We have had multiple days of rain and i don’t have any leaks where I caulked.
From OSI
We appreciate your positive feedback and are pleased to know that you are satisfied with our product.
Thank you for sharing this feedback. We are so sorry to hear about your experience with the OSI GS121 Clear Gutter Sealant. What is being described i...