It doesn't get the wax's protection layer to build up and harden which makes it last but does fill up the gaps in paint temporarily so it shines but it won't last even the next wash / spell of rain
Properly done (e.g. I apply on 2-3 panels, rub out the first one and apply on another then rub out the second one and so on) even cosmic (classic one) give the paint a hydrophobic finish for 10-14 days with a wash every other day (where the dirt doesn't accumulate and washing the car with a pipe without any shampoo clears off any dust without rubbing)
Sometimes when I'm in a hurry or don't feel like doing it, I do ask for a quick wax though (results below)
