Yes, Liquid Wax is totally safe to use on almost every surface. The only thing we recommend to completely avoid using is raw/untreated plastic, rubber, and decals.
The plastics that are safe are 'shiny/glossy' painted plastic parts, headlights, and taillights.
It's the unfinished, raw, usually black or grey colored rubber/plastic such as window trim and plastic bumpers that sometimes have issues.
To avoid these areas we suggest applying 1-2" away. If you notice some accidental application, simply wipe it off before it dries.
Besides those rubber and plastics mentioned, every other surface is safe such as your glass, paint, metals, rims, chrome, clear-bra, fiberglass, and more. We've even had customers use it in their homes, on their stainless steel appliances, granite tops, even the kitchen sink!