Clean your roof - get rid of any rust with a wire brush and wash to get rid of other debris. Seal openings with outdoor caulk and leave to dry. Then do the tight areas with the sealant and a paintbrush. Then take a roller and apply the rest of the sealant. Depending on how long the caulk takes to dry, the job takes less than a day. Do it when it's dry.
Get Titebond Weathermaster. It is far and away the best sealant. It's really thick and this means that it covers everything - every little hole, every crack. Apply it with a paint roller along the roof, and leave to dry. Boom, it will be protected for years. You won't have anything to worry about. You don't even need a primer for it.
Don't, whatever you do, try sealing your roof if the weather is unpredictable on the day that you're planning to do it. I did this and really messed it up when the rain started! Other than that, you can just buy the sealant and whack it on with a sprayer.
Get an extendable roller that is specially made for sealant. Clean your roof thoroughly beforehand - you don't want anything trapped beneath the sealant. You may need to do corners and stuff by hand, but otherwise the roller will do.
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