So, my search for a suitable spray can match for "Humbrol 128" for my Bales 7 Ore Carrier came to nowt.
Figuring i've tried to be as accurate as possible on this build that i can't compromise now, i've bitten the bullet, bought a couple of cans of the stuff and the biggest, softest brush i could, taken a deep breath and hand painted it.
Its turned out okay, with no streak marks or lines at all.
Very glad i did - its considerably lighter than leaving it in the grey primer would've been. But its a struggle to get used to a satin finish ship.