well i call 'trowelling up' anything after ive flattened the second coat...i call polishing nipping back to it when its got loads of dark spots and just wipping over with a dry trowel, or maybe a light mist off the squirty bottle just to give the customer something to stroke!...
to be honest i tend not to polish too much anyway, ill try and get it right 2nd trowel after flatten, all about the timing...