Kroil Original Penetrating Oil (Aerosol Spray-10oz Can-Case of 4), Penetrant for Rusted Bolts, Metal, Hinges, Chains, Moving Parts, Rust, Corrosion Inhibitor (AZKS102C4)

Kroil Review I use Kroil at work for a major airline, and it's hands-down the best penetrating oil I've ever used. Whenever we run into seized bolts, nuts, plugs, or any other stubborn fittings, the first thing our aircraft mechanics do is soak it down with Kroil. It works 100% of the time — flawlessly. No matter how stuck or corroded a fastener seems, Kroil finds its way in and breaks it loose without damaging threads or parts. It's become a go-to tool in our maintenance routine, and I wouldn't want to be without it. Simply put: if it's stuck, Kroil will free it.

I'm in my sixties. I've worked in the trades most of my life. My last job I worked at for 20 years. The old timers, when I started, had worked in the same trade for 50 years, pipe fitters, mechanics, corrosion guys. They could do anything. The only penetrants they would allow on their trucks was Kroil. So I have a seized bolt on a sandblaster at the shop right now. What am I going use to remove it? Kroil. Why waste time with anything else