A few tube's of LOCTITE PL . Premium Polyurethane Construction Sealer / Adhesive caulking will patch any small nail or screw holes and comes in a few colors. For a over all roof coating Ames Super Elasto-Barrier is a waterborne liquid dual-rubber coating. It is used primarily for roof, wall, and roof deck waterproofing in extreme wet situations such as ponding water. Available at Ace Hardware Stores.
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