Hey Turbo, welcome. I'm the second Canadian to respond.
When I first started waxing, I put wax on too thick, and had residue and staining, and even paint streaking. It is a common over-the-counter (OTC) mistake. I'm sure that will be a big OTC sell, but there are lots of good products sponsored by advertisers/supporters of this site, as well as fans. And none of them stain much when used properly, or have residue. Some polishes leave residue though.
I apply wax as thin as I can, so that it is enough to only break the light. I find, of the ones I use, Pinnacle Souveran easiest to apply, then Poorboy's (PB) Natty's, and I seldom apply either too thick. PB's EX/EX-P is very easy to apply, but also easy to put too much. Meguiar's NXT Tech Wax is a harder to use product, but not bad for OTC, and good for older finishes. There is a range there, but used well, all of those will shine, protect, and not cause problems.
