Its a messy job, I wore goggles and had to lay under the car to do it, plus the rear end is still in the car which is another obstacle.

I put mine on a lift, wore a poncho and used a pressure washer. Stripped it clean. I think I used a 25 degree tip. took about 45 minutes to do the whole underside. You will get wet!!

The tricky part with under coating is the mess you have to clean up afterward. When it cold you can chip it off better. We usually mount the body on the rotisserie and turn it up side down and coat the hard to get under coating with diesel fuel and let it sit and scrap it off a little while later. We do it over a cheap tarp we can later throw away. Then send it out to get blasted in the hard to get areas. Seems to be about the most time sensitive manner we have found. Pressure washer seemed to make a whole other mess that now has to be cleaned up.

I have done a car on a 4 post hoist outside. Blue tarps all over the ground. Spray bottom of car with diesel or other petroleum based solvent them used a high pressure steam cleaner. Looked beautiful in a couple hours. Then throw away the tarps.

Yeah!?!?!? But what did you look like??? LOL