Ratings & Reviews for OSI GS121 10-oz Exterior and Specialty Clear Paintable Solvent Self Leveling Caulk

GS121 is a great product!

GS121 is a great roof tile adhesive that will ensure your gutter projects are durable and strong!

Great product

I use this when installing or repairing gutters. I make sure to put this where ever I put nails or screws in. I also use this on the seams of the gutter to make sure they are water tight. I also like that they hand a squeeze tube and a standard tube. Would recommend.

Define durable

I love this sealant! I appreciate how well it holds up over time. Highly recommended!

works great

holds up well in the weather. great seal. stopped the leak at a gutter overlap

CLEARly works

Put on while wet and still sealed up the issues. Somewhat came out solid at first but was malleable.

Worked

Works hold water out but for the price seems really expensive

This is good stuff.

Still holding strong on my gutters over 20 years later.

Great gutter glue

Worked great for what I needed. Installed a new gutter downspout and was able to use this instead of screwing it togeter

Works and sticks well for waterproofing toilet

I know it says not for indoor use but that is because of the odor that smells like paint thinner or similar, but just for a couple of days. I sealed toilet base to a gloss tiled floor and the tank to the bottom part for a fast temporary repair instead of taking it apart. Has held now for 5 months.

Best sealant for metal

It is not only great for aluminum & galvanized gutter seams, but also storm collars on roof jacks that vent gas furnace and water heaters. Unlike silicone that will get brittle & crack, this sealant will remain flexible and adheres to metal much better, especially new galvanized.

Best RV sealant you can use

I bought this a few years ago for use in my rv. It works great around windows and roof vents. Best part is you can use it in the rain when leaks are most apparent. I’m about to go buy a second tube. I recommend the 5oz tube because you can reseal it and use it without having to unplug the end. The cap keeps it ready for use whenever you need it.

Just didn't work

My hand hurt for days after trying to use this stuff. Very difficult to squeeze it out of the tube. It also gunks up easily and does not seat itself into joints in the gutter. Used it repeatedly on the same connection and it continued to fail (leak). Completely useless.

Do not use

When i removed the cap to squeeze the glue out of the tip the back seam exploded and glue went everywhere

Too recent to rate

It's a newly applied sealer. Check with me in about a year if you want to know about how the product perorms

Good product

Good product, its like a big tube of model glue. Use liberally as the glue will flatten and settle as it dries. When it dries, the bond is very strong.