I'm looking to use masking tape, I see that it has done a neat job for you. Is this the small roller referred to on other blogs, no longer available, or a general purpose small roller cut down to 20mm? Is it foam?
I couldn't find a small roller so just made do with a bigger foam roller and cut it down to roughly 20mm, a little mucking around but works a treat.
The paint I got from Rextel was a little on the expensive side and knowing what I know now I would've still got the Chromate undercoat to help prevent unwanted corrosion etc but I would then just use a good 2 pack car paint for the final coat.