[i][/i]I used garage floor paint on mine. I got a gallon of Rustoluem brand at Pep Boys for about $50. I got the kind with the flecks in it. I made sure to put some in the seem between the floor and the sill to create a "seal" so nothing could get under there and cause rot. I also painted up the side of the sill so the whole thing is sealed. I wasn't sure if it would work on plywood since it's designed for concrete but it's been on for over 15 years and it still looks great and isn't peeling or chipping anywhere.

I occasionally put my mower away wet and the floor has seen plenty of oil and gas from leaks and spills. I would highly recommend this method. NOTE: I applied this when the shed was brand new.

Ed