Yes, I'd read the can labels, and am aware of the geometry, but firstly, I was gong to follow Astrobaby's recommendation of 3 coats of Rustoleum white on the main tube and finder, and 5 coats of the Hammerite black on the mount (and possibly the 3 legs, although she didn't specifically mention those (yet?)), and secondly the manufacturer's estimates, assuming they haven't been exaggerated, would probably not allow for the following. A relatively small curved object like a tube is going to have continuous overspray compared to a flat surface like a car door, and a small complex shape such as the mount is going to have huge overspray, as are the open truss legs, perhaps 50% wastage. That's why I'd value someone else's experience.
Davey-T - that's interesting to hear, although I thought the mount didn't look you could roll it. I'll try a small roller on the first coat. PS my border collie lady is chuffing at me as I type -walkies!
DaveL59 - Powder coating would be very nice and hardwearing, but yes, probably pricey, and I agree, doing it yourself is the best.
Thanks guys,
Danny