Grovetec flush cups

Has any body installed the Grovetec flush cups in a synthetic or fiberglass stock? What epoxy did you use?

Looking to put a few of these into my HS-Precision stock to replace the stripped out swivels.

http://www.grovtec.com/catalog/tactical-...s-gthm-289-201/

youtube?

I've watched them. The problem with YouTube is they show you their way to install it, but never give a follow up review like if their way didn't work. I was hoping to hear from somebody that did it and it's still working a year later