Dry nail polish between coats, or not?

Every article I've ever read in a magazine says to let polish dry between coats when giving yourself a manicure or pedicure. But when I get it done at the salon, they just put on the 2nd coat right after the 1st, and it still looks good. Does it really matter? Does the acetone in the polish 'meld'... show more Every article I've ever read in a magazine says to let polish dry between coats when giving yourself a manicure or pedicure.
But when I get it done at the salon, they just put on the 2nd coat right after the 1st, and it still looks good.
Does it really matter? Does the acetone in the polish 'meld' the 2nd layer into the first, regardless of whether the 1st layer is dry?
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