I decanted some auto primer surfacer from a can and thinned it out for the undercoat...
the underside is Gunze Aqueous 31 White Green, which according to the paint matching site is the equivalent of the humbrol 90 beige green called for in the instructions..
Hopefully get a chance to make a start on masking the canopy tonight
I'm expecting this to arrive anytime now, quite possibly tomorrow, may shed some more light on the subject. Mind at this stage I trust you guys over the instructions!