Sikaflex1A Polyurethane Premium Grade High Performance Elastomeric Sealant, 10.1 fl oz Capacity, Black

I used this to seal the base of my lathe against coolant leaks. Would recommend.

We started using this for horizontal gap filling between door/window sill pans and the actual sills. The viscosity is awesome as it works its way into the tiny gaps and levels itself. No other caulk we've found works as well as this to prevent water penetration.

Wverything that i was told about this product is true! Great for wayer proofing and fixing leaks on drain lines, gutters, windows, skylights, ponds and many other applications.

The viscosity of this black goo has a strange characteristic: as you squeeze out a long bead along the edge of my sunroof molding and glass, the thick bead CANNOT be re-brushed or smoothed out! It must be applied in L-O-N-G, steady, smooth strokes. Only way to re-coat for more thickness is to wait 2-3 days to dry, then, carefully use an ultra sharp razor held flat to a level plane and pull the blade slowly across the unwanted higher ridges of dried black rubber.I can see that this process will need to be repeated periodically, depending on how long the weather elements (blazing hot sun in North Carolina) will be blocked by this rubber seal.

Product is great the packaging from Amazon is bad. They crammed 3 tubes in a box too small and broke the tips so the sealant was leaking from the tubes. Had to send them all back and just a waste of time. Lowes carries the sealant for the same price so a better option.

I've been using 1a for years to seal concrete water tanks. Never had it leak or break seal. Great for other materials too. Professional quality stuff.

Not impressed with the actual product…

We had a water problem in our basement. Water was seeping through cracks around the plumbing (sewer) pipes penetrated basement walls below the ground. After we dug outside and used 1-A to seal all cracks all problems solved!!!it’s the best product for underground seal!!