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I spray my zippers with silicone. I have used soap and Chapstick, but like silicone best. I have also used candle wax to lube zippers and the snaps on my boat cover. Dry graphite is also recommended, but is messy.
I've used 3m 77 many times the key is to spray both surfaces and wait till it just starts to get tacky ( not very long) and then put both pieces together. it works really well done a lot of interior work on cars with it. The key is to have an even layer on both surfaces your mating. Good luck it's not that bad.
Patches worked well for the most part and the 3M did it's job. The big patches however aren't staying down as tight as i'd like. I'm going to try sealing the edges with clear gorilla tape, it's not sticking how i'd like, so i'm gonna hit it with a heat gun to see if it sticks better.