Hey guys - not been a member here for long but been usin an airbrush for a fair while. The feathered edge with some steady handed airbrushing is unbeatable especially for tank camo.....methinks I have done the exact model - it's a 1943 model T34/76 - Tamiya? with battery diagrams on the inside of the hull base???? lol
Good idea with the blu-tack but I suspect the paint's creeping in under the blue tack and being held there by surface tension until dry! I used to use cheap s*** maskin tape and this happened
AAAAAAAHGHGHGHGH!!!
Anyway chief, hope this helps.