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The fix: Seal the seams
Every connection on a metal gutter needs
to be sealed: end caps, splices, drop outlets
and miters. Buy a product that’s specifically
formulated to seal gutter seams.
Seam sealer can handle submersion for
long periods of time. It’s also resistant to
light, which it will get plenty of.
Most important, high-quality seam
sealer is runny, so it can penetrate down
into the seam for a durable, long-lasting
connection. Most products refer to this
property as “self-leveling.” And the runnier
the better, so if you’re applying it on
a cold day, keep the seam sealer somewhere
warm so it stays fluid.
Try to remove as much of the old
sealer as you can, and make sure the
area you’re sealing is completely
dry. Home centers usually stock
seam sealer near the gutter parts.