evening chaps, i've been wondering

i've been stocking up on products and have enough to get on with for now

well you cant have enough products
so i've got two polishes, megs deep crystal stage 2, and pb's proffesional polish 2
my questions are
can i layer them as i reckon the megs gives a nicer shine? but the cutting on the pb's is better so i was thinking of pb's then megs.
if i use the pb's does that take the point out of megs stage 1?
and with waxes (got natty blue and DJ light fantastic) can i layer one over the other? or is it just pointless? gonna wax with DJ, then maybe go over with natty blue? is there any benefit to this or if i do it the other way round?
and for my last question, would it be worth using natty blue on a silver gtv rather than the light fantastic? i want to natty blue it because of cost really :embarassed: