Peter

the PR9 had just come back from Afginistan and i believe the RAF had painted them a light grey colour (as seen in Aircraft Illustrated). However when you got up close it looked as if it was a water based soloution as lots of it was coming off and leaving the hemp colour below.

Ive just been to Marham today (posted a few pics on the Historic forum) and from a distance could not see any grey left.