Humbrol enamel Gloss red 19 A0206. Also has 0422622C on my new tin, not seen that before. I apply it in a stone chip with a very fine brush, then wipe it all off quickly so it leaves a tiny anout in the chip the same height as the rest of the paintwork. A 14ml tin is a couple of quid from any shop that sells those airfix model kits.
