Seamless alum. gutters were installed maybe 17 years ago on my little brick bungalow in midwest US.
"Seamless" on the straight lengths. The corner pieces were sealed with something that looks like caulk inside the gutter.
I noticed one corner leaking the other day. Exactly where it does the 90 degree turn.
What should I use to re-seal inside the corners? 100% silicone caulk? Maybe DAP (I won't touch GE)??
Thanks, Peetie