First roughen the area around the hole with a wire brush or sandpaper and then clean it.
How to repair leaky roof flashing.
Small nail holes left behind from old vents satellite dish brackets or anything previously attached to the roof can allow water to enter and cause damage for years before leaking is noticed.
Start low soaking the area just above where the leak appears in the house.
Plug pinholes with roofing cement and patch holes up to about 3 4 inch in diameter with a patch from the same material as the flashing.
Use a roofing nail to keep the section down and apply some caulking around the edge to seal against water.
Spread some roofing tar under the edge that is sticking up and bend it back down to a flat surface.
For example soak the downhill side of a chimney first then each side then the top on both sides.
Patch the nail or screw holes by slipping a piece of roof flashing underneath the shingle.
Step 3 remove metal roof flashing.
How to repair roof flashing small holes or corroded spots in flashing can be easily repaired.