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On razors made of horn 6 years and still going :) On rifles :shrug: Decades, I don't know exactly when Acra-Glas was invented, the new stuff is even better..

This stuff is actually the shizit, it can be adjusted for viscosity on the spot much like having Acra-Glas and Acra-Gel in the same package...
The only difference between this and normal epoxy, is...

Brownells Acra-glass repair kit with Black and Brown dye..

I do the repairs after initial sanding, I let the repair fully set, then sand to fine, Neetsfoot Oil bath, Buff to a sheen...

That...