I have used spray paint on planes and if the fuel proof clear gets scratched then the underlying paint is toast,its a little bit more pricey, but for a good non bad smelling water based fuel proof paint, I have been using www.warbirdcolors paints with great success I thin it about 30% with water and it shoots well with my airbrush a little less with a HVLP gun.
there is also a clear coat available for sealing the paint job.
for a silver metal paint,a product available from paint stores called Modern Masters(Silver Opaque)looks pretty good and has actual metal flakes in it but gives a fine metal finish.
my prefered tools for spraying a compressor powered Binks wren-B airbrush,a graduated syringe for acurate measuring just enough paint and water to do the job.
and some results of my labor my 60 size TF Jug