a couple options.
val spar makes a two part spray paint that is a base coat and top coat, can be found at michaels or ac moore, craft stores, by allowing more or less drying time and how heavy you spray effects the width and length of the cracks. think its about $7 a can.
or spray gloss spray paint over wet flat spray paint and it will crackle, found that out the hard way. youll have more color options doing it this way. almost every color now comes in a flat, semi gloss or gloss
then you can always spray a lighter/transparent color over it on the top or the bottom.
im sure theres other methods for the guys that use airbrushes, but ive always used spray cans
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