The Sherman Firefly was a World War II British variant of the American Sherman tank, fitted with the powerful British 17 pounder anti-tank gun as its main weapon. Originally conceived as a stopgap until future British tank designs came into service, the Sherman Firefly became the most common vehicle with the 17 pounder in World War II.
After giving a base coat for the underneath of Humbrol Dark Green. The model was then given a spray of Warpaint British Armour. The Dark Green spray adds shadow.
As you can see from this closeup, the spray does give the model an even coat, and combined with the sculpting does show off the cast turret that the Firefly had.
Here is the Firefly with three regular Shermans (the resin models from Open Fire).
See the workbench feature on my Flames of War Sherman Firefly VC.