If the hole is small you can use plastic roofing cement.
Patching gutter leaks.
Dry the area with a rag as it must be completely dry for the caulking or roof cement to adhere.
Leaky gutters are easy to repair.
Leak stopper rubber flexx has a great 2 part system with waterproof tape and liquid coating.
Any issues like this need to be resolved before new sealant can be applied.
Finally thoroughly clean the area of dirt debris shingle granules etc so that the new repair will hold properly.
Remove any screws or connecting hardware at the joint and then disassemble the leaking portion of the downspout.
2 clean the joints replace the gaskets.
If the metal gutter parts have rusted through you can quickly and easily patch it.
Using a small trowel a gutter scoop or your gloved hands clear away as much debris as possible dropping it into a bucket for disposal.
Then use a power washer or the strongest blast from your.
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Sand away as much of the rust as possible and spray on a rust preventative paint.
This guide explains how to fix gutter leaks specifically when repairing a small or large hole in metal gutters.
You may need to remove other gutter or downspout sections near the leaky joint first.