I'm with you on the small tin option, I bought the quart tin,I re-sealed the lid after use and a couple of days later I could hardly get the tin open again! :mad: It's as hard as nails!
I found a little goes a long,long way. Tried an experiment with a scrap piece of metal. I 'attacked' it with 40 grit sandpaper and it stood up really well! Great stuff!
I've covered my entire chassis,underside of my cab,cab fender wells,inside of the roof,the back of the dash and the rear of the cab behind the seat with under 3 pints! Brilliant!

It dries to a lovely gloss,shame a lot of it won't be seen!
Jock.