I dont do much in the way of customising TF's anymore... But when I did and when I do My Zoids, for big spray jobs I usualy use Touch Up Car spray paint (Not enamel.. it fills in all the details and is too sticky... and chips.)

I only ever use Tamyia Acrylics for anything that involves a brush. Ive yet to try the Tamyia Spray cans... but some others might know more.