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You can use Bowflage, and clear it if you do not want something perminent (well, no paint is perminent)
or you can use Krylon camo paints. I allways clear them after to harden the surface. Otherwise, a hot humid day groundhog hunting, and your potentially rubbing some of your camo off the stock with wet clammy hands. :x
I've done a bunch of stocks, and find these work best for me so far, but Im no expert.
Here is my 300 win mag Savage.