Mike: this is a metal gutter. I caulked the seams with "Micro OSI Gutter Premium Sealer." I still have half a tube left, but I'm not sure it will work.
James: I can't take it off the brackets 'cause it's too long, 28'. By the time I got the resealed gutter back up, I would probably have bent it back out of whack. I wonder if I can take a picture and put it in here... You're right about the gutter needing to be wider, but I live in the Tri-Cities of WA state, and we don't have a lot of rain here. I mainly wanted the gutter to keep the condensation from the top of the house, off my deck, furniture and occasionally, me ;-)) You're right, a hard rain will make the water miss most of the gutter.
Gutterdog: There are 3 metal pieces about 4 or 5 inches wide that go between the 10' lengths of gutter. Those are what I called the joints.
I think I used clear silicone. Lowe's recommended it to me with the parts. I had a hard time keeping the nozzle aimed at the seams, because of the overhanging metal roof. How can you push the silicone into the seam?
I have not put any sealant on the outside of the gutter (underneath).
That may be my only option, unless I can find someone who knows what they are doing and have them seal it after I scrape off the sealer that is in there now.
Thank all of you for your help! It was -2 degrees here last night, and it isn't looking good through next weekend, so I won't be doing anything for a while. No problem, as we don't have much condensation running off the roof in freezing weather, huh? LOL
I thank you.
vic