Before painting with your preferred metallic color, paint a coat of a solid paint color that is similar, as Metallics are fairly transparent this will help with coverage. For Brushed Steel use Little Lamb underneath.
 
Base : waterbased
Coverage : approx 75 sqft per 500 mL
Finish/sheen : Matte with mica pigments for shimmer
Benefits: 
Non-toxic
Minimal prep work
Easy application
Exceptional coverage
Gorgeous matte finish
No sealer required
Built-in topcoat for amazing durability
UV, water, and stain resistant
Lead-, ammonia-, formaldehyde-, and phthalate-free
7 year shelf life
 
Clean up : water
Dry time : 30 min approx
Recoat time : 1-2 hours approx
Cure time : 21 days approx
~directions~
How to clean surface : mild soap and water
Can be used over : most wax-free surfaces; tricky surfaces with use of Ultra Grip TM
Can it be painted over : after re-coat time
How To Use : prep, paint, done