These German Panther's were painted in a solid Dunkelgelb scheme using Vallejo's "Middlestone". The primer coat is Vallejo's Black Acrylic Urethane primer; this was the first time I've used this new product and I think it performed wonderfully! I've got a big bottle of both Black and Grey and I think I've settled on a primer of choice :) They do sell White but I've not tried it.
The mufflers are painted in layers using Vallejo's Panzer Aces rust colors (dark, starndard, yellow). Overall I think the effect was just what I wanted, contrasting yet weathered and somewhat realistic.