If you think tape it off is easier than the spray paint might be better.
Never painted the anodized aluminium surface before. I know Par4QC likes Rustoleum product. Found this one,the Aluminum Professional Fast Dry Enamel Spray Paint by Rustoleum.
I would use any flat paint from auto store.
Still think a Q tip and any thick coating of flat paint would do. The only one you had scraped off the paint and the anodized surface might need to be primed first/