I've had great success with the Rustoleum in the taller silver can, SKU# 7592. Dries very fast and the finish is smooth and durable. No aversion to the plastic fusing Krylon brand, but I thought the white when compared to the Rustoleum did not look as good.
However, after some more thought and investigation, if you're going Sandtrooper, what does it matter.
I used the same paint, works and looks great. When painted the armor retains the gloss under the dirt look.