XFasten Silicone Sealant Waterproof Black Cartridge, 10.1 oz (4-Pack) Black Caulking Silicone Adhesive Sealant Cartridge for RV, General Use, Window, Door, Glass, Automotive Leak Sealing

Great seal ability and durable. Works great as a sealer and an adhesive. Highly recommend this product!

Worked very well for the intended use! Looks sleek and easy to clean!

This sealant works extremely well on RV roof vents and more. To fix leaks and cracks. To extend the life of my RV’s roof. And it is a good value and easy to use.

It's OK, but it dries FAST. I used masking tape along the borders and after 3 minutes i tried to remove it but a thin film had already hardened on the silicone and removing the tape messed the initial smooth surface up. Too bad.This is not the first time I have worked with silicone. Just be warned, that's all.

The black silicone I've had before from other brands was very glossy both before and after curing. This one is decidedly not glossy, which could be desirable in certain applications where you don't want to draw attention to the sealant, like maybe with black granite countertops. This seems to have acetic acid cure but it's mild - not noxiously smelly like the GE product. Cure time is a good balance whereby it's not skinning over on you before you have even had a chance to tool it. I will buy another tube for sure , good deal. Nice spout and cap included too. Me likes it.

I bought this sealant to help seal the slide-out of my travel trailer. I used a caulk gun to apply the sealant to the trailer once I had prepped all the surfaces. The sealant goes on very easily. Although it can be a little sticky at times. I used soapy water and some kitchen roll for cases where I applied too much or got it on my hands. In the first 5-10 min it will easily come off if you make any mistakes in applying it. I have had it on my trailer for a few months, and I am really impressed on how it stands up in the weather. Our trailer sits out in the full sunshine for most of the time, and the sealant holds up very well. The only "negative" is that the curing time is about 24 hours not 30 minutes if you apply it in large quantities or in a large area like I did.

This does a great job

This stuff is NOT silicone. I bought it for caulking joints in concrete counter top forms. First sign that it wasn't really silicone was the lack of acetic acid smell. The next day I went to peel off the excess and it was a goopy mess with only the top surface set. It didn't peel as expected but broke off in chunks. Now I have to spend time to clean it off and have to buy real silicone caulk somewhere else. Worst part is that I bought a pack of these and didn't get around to using them for a few months, so now I can't return them.