Total agreement that surface prep/cleaning is VERY important! Heck, for years I've used white school glue on everything, including 2 - .45-70's & never had a problem, (except on scopes I never glued). Works for me & fairly easy to break.Clean and oil free is very important. Loctite also sells a primer that works great to help it bond. The blue should be sufficient, I wouldn't use red. Loctite also has an expiration date. I haven't seen an issue, but according to one of their reps, it can make a difference.