Protective coatings

I’m re-exploring protective coatings for pieces containing both
sterling and gold. I’ve sent a couple pieces off to be
professionally powder coated clear but, I’m concerned about the
thickness and feel. I’ve just bought some Sculpt wax to try. This
looks and feels excellent but, does anyone have experience with how
long this or Renaissance wax holds up.

I’d appreciate any advice for low volume solutions. Regis