The laquer wont key to the base coat properly, which means if you get a stone chip ar any other damage the laquer will peel off(peeling laquer). Its where the laquer flakes off from the basecoat colour. Have even seen it when people have jet washed there car and on the edge of a panel it took aload of laquer off, was a freshly painted quarter panel but the painter didnt laquer it until the next morning.
If you are going to leave the base coat over night or for a long period(dont know why you would?) then either scotch the base coat up or nib it off with some 1200 then do a drop coat of base then on with the laquer.
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