Depends on the product. I used Meguires Hybrid Ceramic Wax (in a blue bottle). I applied mine after a wax without any other steps (no wax stripping/claybar/paint correction etc). My only suggestion, is to ensure you have even coverage or else it can streak. Some will allow you to apply to a wet or dry car. Some say spray on/hose off, but you can also use a damp microfiber cloth to ensure even coverage then rinse.