My wife knows better then to touch anything in my shop or garage. Heck she needs a permit to gain entry. I don't touch her purse or organize kitchen cabinets either.
Looks like shellac flakes. It should work.
Now you're talking. Another way to protect the bolt threads in the grip area would be to put on some lock nuts. ??
Took the BP 12 ga sxs to the woods looking for Mr. Thunder chicken just 20 minutes into the task and one trigger pulled. I think the shot parted like the red sea around his head and back into the under brush he went. No matter it was a good day.