I've done a few stocks and practiced/experimented a bunch over the last year.
Here are some of my latest practices. Instructions below.
1. lightly sand the stock with 220 grit sandpaper; this is VERY important to make sure the paint sticks well
2. wash off and let dry; if it is oily, maybe clean with alcohol
3. tape off barrel channel and action areas
4. I like to spray a primer coat first
5. I then spray a base of the textured or stone paint to give it texture (practice with this stuff because some paint take a heavy coat and some a light to get the right feel)
6. then I spray my main coat
7. while main coat is tacky, I spray with the webbing
8. let dry for a couple days
9. spray with a heavy coat or two of flat clear coat
...and you're done!
Krylon has quit making their webbing (or I just can't find it) and I've started using the below Montana. I like it much better because I can adjust the nozzle to adjust the thickness of the web. Also, it seems much more uniform.https://www.montana-cans.com/en/spray-cans/effect-sprays/marble-400ml/montana-marble-400ml