Find total area: 12 x 16 = 192 square feet.
7 pints are needed for each square foot , multiply total square feet by 7 pints to find total pints needed:
192 x 7 = 1,344 total pints.
1 gallon = 8 pints.
Divide total pints needed by 8 to get gallons:
1,344 / 8 = 168
168 gallons are needed