I brush mine on - and it's hard to get decent info from paddocks, but seems to thin nicely with turps, so assume it'll be a semi-synth Enamel. Dries rock-hard and applies evenly and beautifully.
My 88" has 4 coats on a black base. one tin with a roller did the bulkhead, cab, and roof.
Base was from here - I used the Ace Primer, it goes on really well, and flats back brilliantly: Rust Solutions