SuperMerle, I just did my floor yesterday and completely agree with these guys ... I covered 350 SF with one kit, and had about 1/2 gal left over. I'd estimate the leftover would cover another 50-75 SF so that would give a total of about 400. I didn't "stretch it" when rolling, since I knew I didn't need to cover 500 SF, but I'm sure the kit would cover 500 if you rolled it out thinner than I did. But I can't imagine getting 720 out of one full kit. I'd recommend that you buy one full kit and one half kit -- or better yet, if you have a Lowe's near you that stocks it, buy two full kits (Lowe's stocking stores sell it for $194/full kit -- but a non-stocking store will charge you way more as a special order). It's nice to have some extra just in case.