How much does one gallon of laquer thinner weigh?

Which weighs more: a pound of bricks or a pound of feathers? C'mon now... I hope this was meant as a joke.

Well since the question was, "How much does a GALLON of latex paint weight"? um yeah, there is a way higher density in say, thick latex paint rather than water... So I would say you're looking at anywhere from 8 to 10lbs depending on the paint.