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