I've done a couple of sponge camo jobs. They are done using a sea sponge. Not sure if it's what you're talking about but I'll tell you how I do it.
Materials list.
painters tape (for areas you dont want to paint like the surface of the recoil lug)
denatured alcohol (for a good prep)
sea sponges
paint
First good prep is important. Wipe the stock down with denatured alcohol to remove any oils or cleaning products that will keep the paint from sticking. I use Rustoleum camouflauge paints so I'll call the colors what they call them
then paint the stock with the lightest color I usually start with Khaki. Then go back and stripe it diagonally with the lightest contrasting color. In this case I use army green. Then I use a sea sponge (available at any craft or hobby shop they also have them with the art stuff at wal mart).
I spray a puddle of khaki onto a hard slick surface like a magazine page blot the sponge into it and blot it over the green. then repeat this process blotting green over the khaki. The last one I did I liked a lot and used 4 colors starting with Khaki and light green and blotted a darker "deep forest green" over the khaki and "earth brown" over the army green. When I'm done though I dont think it's absolutely necessary I seal it up with a couple of coats of Testors dull coat clear lacquer. You can find the "Testors" dull coat almost anywhere they sell plastic models like at a hobby shop or in the hobby section of a big box store.
This one is two colors
and this one is 4 colors
If that's the look you're after then It's easy and not very expensive. I have found that it's easy to over apply with the sponge so less is more is probably a good rule to follow. If you decide to spray yours then take pics and post em up.
Good luck, BHJ
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