First use a stiff wire brush to remove any rust or corrosion from the hole and the surrounding area.
How to repair galvanized steel gutters.
Steel gutters tend to get chalky over time which may mean that you need to paint them more frequently.
Steel gutters should be inspected regularly for missing zinc and rust.
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Step 1 clean.
The value of hot dip galvanizing stems from the relative corrosion resistance of zinc which under most conditions is considerably better than iron and steel.
Apply plastic roofing cement over small holes.
Use more roofing cement to seal the perimeter of.
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.
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Once the hole is clean and dry spread roofing cement around the edges of the hole and apply a patch of appropriately sized metal flashing.
Clean the area around the leak using a wire brush and some water.
Cover any holes you find in the metal gutter with some roofing cement.
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Feather the roofing cement out on the surrounding area to flatten any steep edges.
Step 2 dry.
Bend the strip to fit and embed the flashing in the cement.
Apply a zinc rich paint over the repaired area.
If rust is already present remove it with a non metallic scouring pad.
Step 3 patch.
Galvanized gutters are made from hot dip steel and have been effectively used for more than 150 years.
To help them last longer they should be repainted or sealed every few years.
You can use the same process for repairing holes in both steel and aluminum gutters.
Select a paint that matches the existing color of the metal as closely as possible.
Weathering will eventually match the color of the repaired area with the rest of the metal.
If you find any remove it by applying a solution of one part household bleach to three parts water allowing it to remain on the surface for 20 minutes then scrubbing off the mildew.
These types of leaks are often caused by loose joints and most of them can be easily resealed with roofing cement.
3 check for signs of mildew.