Very simple process after your armour is sealed and primed , lay down a coat of base colour for rust, if that's the look your trying to replicate. I chose a reddish brown colour. Then I use two techniques to allow this to show through the second paint layer. The first way I achieve seeing the rust layer is salt, simply wet the areas and the coat heavily those section with table salt. Then spray the armor coat right on top. Let dry for about an hour then use a stiff brush to knock away the under layer exposing the rusty colour beneath. The other way is mustard or tooth paste. Spread some in areas the spray paint over wait 10 minutes then wipe the excess paste away! Then to really make the rust pop, spray clear coat on the rusty areas so it's tacky then sprinkle or smear the cimmonion and paprika, then hit it again with the clear coat to seal it in!!!