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You'll find "seam sealer" by the gutter stuff at the hardware stores. Comes in little tubes and bigger "caulk" tubes.
Just make sure the inside of the gutter is clean and dry. It's easier to spread and push into the open seam with your finger... probably best to wear latex gloves. I'd do it when you know you won't get rain/snow for a couple days. It takes a while to set up. It's sticky and hard to get off tools....
Seam Sealer
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I'd use silicone on the inside.
Matt
If trees could scream, would we be so cavalier about cutting them down? We might, if they screamed all the time, for no good reason.
-Jack Handy
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The gutter sealer is a butyl compound and really sticky, I'd look for it.
I started with absolutely nothing. Now, thanks to years of hard work, careful planning, and perseverance, I find I still have most of it left.
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http://geocelusa.com/gutters.html This is what I see recommended the most. I'd steer clear of regular silicones.
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Clean with alcohol and caulk with a tripolymer gutter seam caulk. Regular silicone caulk and polyurethane caulks don't level as well or seal as well. I think the Geocell that was mentioned already is a great choice and should be easy to find at most hardware or big box home improvement centers.
Any free advice given is worth double price paid.
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Silicone also has acetic acid in it which will cause steel to rust.
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I tried everything they sell at Lowes and none of them worked on my gutters. I hear really good things about Rubberizeit. If I had to try it now I would try that.
Ignore the infomercials but google it and you will see that it is a good product. The infomercials make it sound like snake oil though.
see:
http://www.amazon.com/Rubberizeit-Univer...B00GSVO6RS
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