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Keep a tube in your garage. When a storm blows a branch through a roof tile or pops a nail, this will save your ceiling from water damage for the next 6–12 months.
The instructions say to clean the area, but with "instant" products, you usually just knock off the big rust flakes. I used a wire brush for 10 seconds to get rid of the loose paint. Instant Roof Nui Crack
We took a standard asphalt shingle, drilled a 3/16-inch hole through it, and simulated a heavy rainstorm. We applied Instant Roof Nui Crack directly over the flowing water. Keep a tube in your garage
Use a hand roller or the back of a wooden spoon to apply heavy pressure. You want to see the butyl squeeze out slightly from the edges. This guarantees a full seal. I used a wire brush for 10 seconds

