Gaz,
My frame was done by Hutchcoat at York, so I don't know if it rattle can or not, I have though found it to be really hard wearing, it has lacquer over the top so there does seem to be a thick layer of colour on the frame.
Yes I have scratched it and chipped the powder off of the forks but the bike now has some proper tyres on and gets regular use off road, as it should!