Quote Originally Posted by CharlieNC View Post
You will need to sand with 200 grit, especially to eliminate the molding flash marks. Then clean thoroughly with normal solvent. In terms of opening up the barrel channel, you probably will not need to as a varmint barrel fits fine with plenty of clearance.
Yobuck mentioned painting a laminate stock, which is where I though some level of prep might be needed for the paint to adhere. But I think you're referring to painting a composite stock.