1 + 2.) I think you are on the right track with the Blackfire Wet Diamond with Polycharger
first and then a wax layered on top of it. The Poorboy's World Natty's Blue Paste Wax
looks great on all colors it just seems to be at it's absolute best when it's on darker colors, but it should look great on the light blue as well. If you want some of the best protection that looks amazing on blue paint the Dodo Juice Blue Velvet Hard Wax
is a favorite of mine. I've always liked the extended protection their waxes offer and very tight water beading.
3.) I would apply each one with a separate CLEAN applicator, the DI Accessories Yellow Foam Applicator Pad
or the Lake Country Red Foam Applicator Pad
are both great. Wait at least 15+ minutes before buffing off the excess product with a CLEAN microfiber towel. For sealants and waxes I can typically use about 1 - 2 towels per coat I remove, therefore I'd suggest getting 2 - 4 of the DI Microfiber All Purpose Towels
Let me know if you have any other questions and I'll be happy to help.
Greg @ DI