If the rust issue is severe you can consider using a special solution to remove it from the surface.
Repair hole in copper gutter.
Bend the strip to fit and embed the flashing in the cement.
Once the hole is clean and dry spread roofing cement 1 around the edges of the hole and apply a patch of appropriately sized metal flashing.
It s important that the patch match the gutter material.
This specific gutter cleaning process is completed by brushing around the hole using the wire brush.
Apply plastic roofing cement over small holes.
Whatever piece of metal you choose rivet it into place with copper rivets then solder with copper flux.
1 the tarry paste used to fix shingles that can be found at most hardware stores.
Buy a tube of roofing cement 1 40 and a metal repair patch several inches larger than the damaged area.
After the patch is situated cover it completely with another coat of roofing cement.
The preferred method for mending a hole in a copper gutter is to use a piece of sheet copper on the inside of the gutter.
If the holes are larger than nail holes use tin snips to cut a strip of flashing the same amterial as the gutter wide enough to fill the area.
Leak stopper rubber flexx has a great 2 part system with waterproof tape and liquid coating.
Alternatively you can use a joint or decorative cap on the exterior or a piece of gutter laid over the old gutter.
Feather the roofing cement out on the surrounding area to flatten any steep edges.
If a gutter isn t draining properly it s either not sloping toward the downspout or it s sagging and needs to be raised you have to patch any hole right away so it doesn t grow larger.
Clean around the damaged area with a brush and warm soapy water to remove more stubborn.
Locate the hole then remove all loose debris such as moss leaves and twigs from around the damaged area.
Simply squeeze into cracks and holes then apply a further coating around the entire gutter joint.
Leaky gutters are easy to repair.