[mmichaels1970]

About how much blue paint will this require?

Seems to me, that question is all about square footage. One coat of paint at 8 inches for 100 feet = 8/12*100 or 67 square feet. On average, one gallon covers about 400 square feet. So you could get away with a quart if doing one coat. I'd be safe and spring for the gallon as one quart probably isn't 1/4 the cost of a gallon anyway.

[chrisser]

" I'd be safe and spring for the gallon as one quart probably isn't 1/4 the cost of a gallon anyway."

I'd get at least a gallon. I'm guessing you're not going to be carefully controlling the coating thickness and more is probably better within reason. And you're probably not going to have the option of going back for a second coat.

Be a shame to run out halfway through the job.