After two coats of primer, below waterline, I was through most of a quart. Maybe I should have thinned it out a wee bit more?

Varnish is just too easy........ and it would be a shame to cover up the wood on the deck anyways.

: I wouldn't worry too much about the weight of the paint. Far from half a
: gallon, I'd be suprised if you could use half a quart on a kayak hull.