On my Momentum 376THS, I bought some "as seen on tv" Flex Seal Liquid (I chose black) and while the rig was in my shop over winter, I carefully cleaned and polished the inside of the gutter at all the seams, and put on about 10 thin coats of the Flex Seal with a small art brush, following the instructions on the can for time between coats, brush cleaning, etc. It only takes a few minutes for each coat, but with curing time and all it took several days to complete the whole process. Previously I had used a sealing tape, but that only lasted about half of a summer before it started dripping again. It's been about 2 years since I put the Flex seal liquid on it and last inspection didn't show any signs of cracking or peeling. I also used alcohol to clean the gutter just before appying the first coat. It doesn't build up very quickly, so keep putting on the coats until you no longer detect any sign that there is a seam there.