I was looking at an adhesives sealant with 100% waterproof and found this online at my local Lowes for only $0.90. This is usually for $7.98 but they are on sale until 8/24/18.
At $0.90, this is a FANTASTIC price! Grab it while you can! I grab the last 5 from my local Lowes! Good Luck!
This may be YMMV! I don’t know how to look up in brickseek ! If someone want to help out that will be greatly appreciated!
Here is the link