I just came in off the roof, and thought I'd just add a quick update. I did the first round of painting on the tank with a different can of paint, and it's slightly better than the first can I used on the front fender.
This time I used "Paintrainbowchemical" brand "Paint Master Auto Spray Paint"
I also suffered from the first law of BBQ. Where ever you stand, will be where the smoke (or in my case paint) blows. I think I got better coverage than the tank.
I've painted things before in the States with a can of white paint (because I live classy like that

) and had no problem getting good coverage. Here though...
I used up the whole can and I think I'll have to apply another 2 cans before I get decent coverage.
Oh well... I'm off to the pool