+1000 with the other replies.
At a bare minimum I'd say 4 pads to compound a vehicle, if not 6. Switching to polishing you can go to 3~4, but with compounding... the more the merrier.
@David w/Lake Country... THANK YOU! :dblthumb2:
I might add... in addition to what David and others have said, heat building up in the pad is (of course) caused by product and friction on the surface/in the pad. BUT... it is also caused
in a major way by the Velcro at the BACK of the pad and the way it interfaces with the backing plate. Back there it has nowhere to go, and will get terribly hot.
When buffing your vehicle you should do 1 panel, (maybe even half a panel when talking about the hood/roof) and then pull the pad to check for heat. Put the BACK of the pad against your cheek, (not the front) and if it's more than just barely warm... get a new one. After each panel do that, first in, first out until you've gone through all 4~6 of them. By the time you get back to the first one it'll be cool again.
In the early years of the Meguiar's microfiber pads they had a problem with the pads delaminating/over heating. The engineers went to work on the problem and came out with a 'dedicated' backing plate/pad "system" that is designed to work together to help with that friction that was being generated between their pads and other backing plates. Since then you hardly ever hear about those pads failing. (
At least with guys that know how to use them, and clean them with air after each section pass.)
It's easy to see in fact when you try one manufacturers backing plate/system versus another. Rupes for instance has such a hold on the pads that it's darned hard to get ANY pad off the backing plate without damaging it. You REALLY don't want to try and remove on of their microfiber pads after it gets even the slightest amount of heat in in or it'll
fall to pieces!