Interesting. That flies in the face of everything I've learned regarding ArmorAll and it's detrimental effects on finishes of any kind on any surface. I've paid Billy-hell chasing fisheyes in varnished and painted surfaces caused by careless people spraying that stuff (and WD-40) in the vicinity. Call me a Nervous Nellie but I would need more proof before I let it anywhere near a fine woodworking project, gunstock or otherwise.