Update...
Let me start by saying, the guys that do this type of service (John Thomas & others), deserve everything they charge. For an inexperienced person like myself, this is turning into numerous hours over several days. Nonetheless, I'm learning while I go.
This is the "look" I'm going for on this buttstock, except with a little more green paint remaining...these pictures were originally posted by "57Octane":
Made a trip the local "Hobby Lobby" and talked with a young lady in the faux painting section. Told her I was working with some old plastic parts and was trying to make them look like bakelite or embedded with flecks/flakes of fiberglass. Surprisingly, she understood what I was talking about. She took me to the faux sponge section and explained how to use them. So, out the door I went with a variety bag of sea sponges.
Once home, I got out the 400 grit sandpaper to take down some of the gloss on the buttstock. I then sprayed some of the "1942 Dark Tan" paint onto a paper plate and practiced with a couple of different sponges on some paper. Once I felt comfortable with the process, I then moved to the buttstock.
As you can see, it turned out pretty splotchy and a lighter shade then I expected.
Not being satisfied with the result, I thought "what the heck", I'll sand it and give it another base coat and try again. Got out the "0000' steel wool and 400 grit sandpaper again & knocked off some material and shine. I then started lightly spraying the "1240 Gloss Brown" onto the buttstock. To my surprise & delight, things started looking better. I then sprayed a few light passes and ended up with this result. It is very close to what I had envisioned.
Here's some comparison pics to one of my type D stocks with some nice mottlling.
A gratuitous shot of half of my original 601 green paint over bakelite handguard set.
I'll now let this sit for a couple of days before I begin the next process.
Stay tuned....