Thread: Build yourself a fibreglass stock

I use to make the action inlet mold the same way, but after a few uses the silicon ripped apart. I then swapped to useing silicon sealant you get in the tubes. It is a bit of a bugger to work with but is heaps cheaper and a bit more flexible and easier to get out once you have cast the action area.
I did a two part cast like you have, smear the silicon thickly around the edges making sure to push it down into the corners, then leave that to set then fill in the rest. It does take a couple of days for the silicon to set right through.
I put petroleum jelly on the action first to act as a release agent.