Aluminum alloy 5059-H131 panels rolled to 0.25” thickness were prepared using Chemical Agent Resistant Coating (CARC) for evaluation under three different pretreatment conditions.  The pretreatment conditions were abrasive blasted, Alodine 5200¹, and Metalast TCP-HF².  The primer used was MIL-P-53022³ and the topcoat was MIL-DTL-53039⁴.  Corrosion resistance was evaluated under GM 9540P⁵ and ASTM B 117⁶ neutral salt fog (NSF) methods.  Adhesion was assessed under dry conditions using ASTM D 4541⁷ pull-off and under wet conditions using ASTM D3359A⁸.  Prior to coating, the conversion coated surfaces were compared for uniformity and color versus identically prepared AA5083 samples to determine whether or not the alloy differences will warrant modifications to current pretreatment processes.