I suppose this could pertain to just about any wax/sealant and QD but since I have been using Zaino, I'll direct my question toward Zaino users. For those who use Zaino Z-2/Z-5 and top it off with weekly Z-6/Z-8, how do you know when you have to reapply Z-2/Z-5 if Z-6/Z-8 are constantly boosting gloss, slickness and beading? This is assuming the "boosting" lasts longer than a week. Does it?