Rene, here's a little advice. Take it FWIW...
You are working backwards, Amigo.
1) Spray the base color you want on the stock. Let that dry well.
2) Find something soft that will make the outline impression you want and get it wet with paint, and carefully touch the stock with it, and remove, leaving the impression with the color you want.
From what I see, the spray paint is too close, and too heavy on the texture wrapped stock. The paint gets around the texture when spraying, and won't give you the desired results.
Heavy spray isn't always your friend.
