1) you should be able to find it at most boat supply stores

2) I've heard that it can be, but I got great results with rusto

3)getting the tape perfect is ESSENTIAL, allong with proper prep work. For easy masking I suggest the professional grade 3M tape, its usually green, and its about $7 a roll, but way worth it.

4) I've seen guys get great long lasting results on their wheels with Rusto, some prefer it over powder coating!

black is an awesome color, but, it shows defects in the paint and body work much more, its a little harder to keep clean, and it can be VERY hot in the summertime.

hope this helps some!