If it's a plastic stock, you'll have to drill holes at opposite angles from each other all over the place to mechanically lock the bedding compound into it, same with the lead shot/epoxy mix. I used JB Industro Weld to do my Daughter's M7 synthetic. It's thinner than most epoxy bedding mixtures, but helps to work it down into the holes with a toothpick that way though. After it sets up a few minutes and won't run I coat the rest and set the action in there. I did roughen all the surfaces up with paper, but the holes I drilled all over are really what is helping the less than desirable bond to the oily plastic stock stay put. I'm happy with it, happy as one can be with the cheap thing anyhow.