I wouldn't worry about filling any low spots unless it seems like it was caused by water damage. If it pitches toward an AC just keep vigilant that no leaks start.
Not to be the search police but .There are many posts and pics of using topside paint as well as cleaning,buffing waxing roofs before the necessity of painting. There are many vids on Utube using topside paint if going that route . You can get good tips on products in reviews and questions and answer on Amazon. I know some have added a certain hardener to topside paint.
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k