Ok, kind of what I was thinking, thanks Kornbeef! I didn't seal the lozenge decal before I put down the cross, so I probably can't replicate the chipping paint without damaging the lozenge decal underneath. I'll give it a shot, and see what happens. Pics to follow.
BTW, KB, what did you use for the Jasta 11 red? I used Humbrol 20, which turned out a dark crimson.
Thanks
Henry