I have a decal sheet from a Fujimi 109 kit with loads of numbers and squadron markings on it, there might be a black 6 with white outline on it. I'll need to find it though, my stash is all over the place!
Thanks Njaco, but I'm going to mask and spray them, WEM Tyre Black i think! I gave it another coat of Klear tonight so I won't have that problem again..... I hope!