 In other words, if you're not seeing it bead up like you would with a lot of wax on it, you could wax just a little portion, spray bottle it on, and you'll know exactly what I mean by that. But if it's not beading up, there's no protection left, meaning it needs waxed again. So the key there is keeping a good coat of wax on it, and depending upon what you're using, how often you're washing, the type of soap that you're using, which, by the way, if you wash your car yourself, for everybody listening, do not use dish soap.