Step 1: Mix 1 part of AR5100 with 15 parts water. You can add 8 oz of AR5100 concentrate to a 1 gallon container and fill the rest with water to create a 15:1 solution. Use hot water (120F+) to decrease the amount of time needed to remove oxidation. You must mix AR5100 with water to activate the chemistry. Mixing AR5100 with less than 15 parts water will not make it more effective.
Step 2: Immerse item in AR5100 solution until all oxidation is removed. You may also add AR5100 to pressure washers. The solution will change color as it removes rust from the item, this does not mean the solution is spent, you can reuse the AR5100 solution many times until it is no longer effective.
IMPORTANT: AR5100 will leave behind a dark patina on some metals, this surface is not rust and is ready to prepare for painting or welding.
I had some Harley crankshafts that had been sitting in my barn for 10 years, very rusty, put them in a tub with this stuff and they came out looking like new. totally amazed. just ordered some more
Works great on motorcycle gas tanks.
Used AR5100 to remove rust on a coolant transfer tube for my 1949 Oliver HG. Did it as a comparison with an identical part in similar condition to the competition. The AR-5100 did a fine job and seemed to be modestly more aggressive than the other product. Part came out cleaner and brighter. Overall works very well. See my comparison on Instagram @oldtruckswork.
Worked very well to clean up a couple of old gas tanks from a couple of antique lawnmowers I have !! Super product like all of the archoil line !
Brake rotors and drums never cut from 1998 Ranger were seriously rusty. 24 Hr soak in 5100 cleaned them like new, and minor cleanup machining made them perfect. Normal ARCHOIL product - it just works!