Mixing Mud for Skim Coat

Seems like it's not mixed well at the bottom of your pallet. Try leaving a thin layer on the pallet (or mixing board or mixing pad, whatever). also if you are mixing your filler on a pourous surface like cardboard, it can mess up the last little bit. I friend who is a pro body man told me to put a few drops of fiberglass resin in when you mx up your gob. I haven't tried it yet, but he swears by it.

I don't see anything wrong with a skim coat on the whole car as long as you are willing to go to that expense, spend the time, use a LONG board and sand 95% of it off, but may be unnessesary for a driver.