Join Date: Apr 2016
Location: Troy Michigan USA
I had a real oil leaker of a car back in the 80's... it blackened an area of about 4" in diameter where I parked my car on the concrete drive every night. It eventually accumulated to a thickness of about 1/4"... and black as asphalt or tar. I eventually got rid of the car after about 2 years. I used a pressure washer to remove the surface as best as I could, so no one would track the oil elsewhere or slip and fall. Every time it rained the oil would rainbow as it drained from the drive. One day I was cleaning my spray gun with paint thinner, and dumped the excess onto the stain that was left on the drive... now mind you... the stain was still black. To my surprise... the next day, after it dried... a lot of the stain faded. As it turned out, concrete is quite porous, and what was happening is the thinner did just that! It thinned the oil stain... thin enough for the oil to pass directly through the concrete. I kept applying the thinner each day when I got home from work (no scrubbing), just poured thinner on the spot, wetting it, and with each application it eventually faded completely. From start to finish I used about a gallon of paint thinner, over about a three month period and to this day there is no stain left. I don't know if it will work on wood the same way... but I do know it works on concrete.
Woodworking is like wetting myself....Only I know that warm feeling!