Ballistol has been a mainstay of mine for decades. IIRC, it's safe enough to DRINK, LOL. Seriously, you have no worries with the stuff. On wood, it can help to re-hydrate, so-to-speak, and seal-up the grain. I drizzle it on, then rub it evenly with my bare fingers. On metal, it neutralizes my acid perspiration, and keeps my blued-guns safe. In bores, it removes a reasonable amount of filth between cleanings with more hardcore solvents.