2 clean the joints replace the gaskets.
Patching gutter leaks.
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Dry the area with a rag as it must be completely dry for the caulking or roof cement to adhere.
It is easy to fix the leaking rusted seams where gutters connect to each other.
Leaky gutters are easy to repair.
If it is large use a piece of galvanized metal flashing.
If the hole is small you can use plastic roofing cement.
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.
You may need to remove other gutter or downspout sections near the leaky joint first.
Use a commercial grade gutter sealant and simply re apply where needed in a thorough manner.
Finally thoroughly clean the area of dirt debris shingle granules etc so that the new repair will hold properly.
Sand away as much of the rust as possible and spray on a rust preventative paint.
Leak stopper rubber flexx has a great 2 part system with waterproof tape and liquid coating.
This guide explains how to fix gutter leaks specifically when repairing a small or large hole in metal gutters.