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Heard that too. A hole punch and masking tape could work. Paint the colour you want the dots first, mask over, spray the main colour. There's quite a few ways to paint hinterhalt/ambush schemes. I think Archer even do templates.
Once you have the base coats down. You can punch holes in a card using a random pattern, then spray through it. A little practice and you'll look great, it will give you a nice soft edge to the dots as well.
Hope this helps
The art of war is simple enough. Find out where your enemy is. Get at him as soon as you can. Strike him as hard as you can, and keep moving on. US Grant