I painted once, a kit, at the end of he 70ies
Using airbrush and Humbrol Enamel HM06 Field Grey, following info given by Mr Verlinden I mee in a shop in Anwerp ( Belgium )
1 cover all uniformely field grey
2 add white spray as a cloud ( almost all )
3 recover all with matt varnish
4 wait for drying
5 use Wisosr & Newton Oil Black, diluted to liquid form, brush everywhere and clean directly with sponge, black will say in recesses
6 drying time
7 apply mix of field grey and white Humbrol, in an almost dried form, with a flat brush in imperceptible quantity ( drybrushing ) on all embossing, le it dry, do it again, let it dray do it again with lighter and lighter colour
8 drying time,
9 back to 5, 6 and 7 with almost completely white on the mos raised places
10 drying
11 as I wanted it, as at the end of winter, rust everywhere, I used Burned Siena Earth diluted, and let it flow by gravity
12 camouflage net are medical bandages, weted in a mix of 50/50 water and white glue for wood, puted in form on the tank, aplly various green by drybrushing
And the result was