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By 'whacking paint on', is that a NZ technical term for 'I carefully applied the first coat of black with the precision instrument known generally as an airbrush'?!
The bomb load would depend on target - 500lb and 1,000lb GP bombs , or Incidniaries, or a mix, 500lb and Incendiary.
( The 250lb was rarely, if ever, used on 'heavy' bombers, and rarely even on Medium bombers by this stage of the war - mainly fighter bombers such as the Spit/Hurricane, again rarely as the 500lb could be carried.)
I'd let you have the bombs off my Lanc, but I'm thinking of using them in a diorama - of a Halifax.
Have you got any bombs left over from your Airfix Lanc?
I've been thinking of trying the same recently, so the idea was in my head already...
(Love your new siggy btw!)
I've got the bombs from my Lanc going spare, and can probably give you some from the Stirling too... don't worry about postage, just tell me how many of each type you need.