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Small holes or corroded spots in flashing can be easily repaired. Renail loose nails and cover nail heads with roofing cement. Plug pinholes with roofing cement and patch holes up to about 3/4 of an inch in diameter with a patch from the same material as the flashing. First roughen the area around the hole with a wire brush or sandpaper, and clean it. Cut the patch larger than the hole and affix it with roofing cement, then cover the patch with more roofing cement.
Flashing that is badly corroded will need to be replaced. You will have to remove several rows of shingles as well as the old flashing to do this. Consider whether you have the skills and time to do this; otherwise, call a roofing contractor.
Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing. Recaulk the joints between the flashing and the roof. If you are working with valley flashing, lift the edges of the surrounding shingles and spread roofing cement on the flashing about 6 inches in from the edge of the shingles. If you are resealing drip edging, seal beneath the shingles but don’t seal the drip edge along the eaves.
1) Patch a hole by seating a small rectangle of galvanized sheet metal in roofing cement.
2) Seal the joint between flashing and other surfaces with silicone caulk.
3) Seal edges around skylight flashing with roofing cement.
 
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