What's the best way to seal the corners of leaking gutters?




The corners of my gutters are leaking and I would like to know how to repair them. Should I clean gutters first and then do the repair to the corners?
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Here's so info. And a youtube video for you.
http://www.harryhelmet.com/gutter-miter-corner-matters-how-to-deal-with-leaks/
Flex seal, spray it on and be done with it. Find at home improvement store.
Check into that "new" product called Flex Seal.
https://www.youtube.com/watch?v=4y2OomTBNOc
l love flex seal-comes in cans that you can brush on and also in clear-so it doesn't show
okay, you've got me...Flex Seal.
Butyl rubber or gutter caulk. Flex Seal is great for a quick temporary fix but will not last. It breaks down, tends to flake, and wash away over time.