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your looking at allot of work no matter what method you pick .
that crap is not made for cars that's why NO auto maker uses it .
we use RM 900 in a pump up sprayer and soak the crap out of the area were it is .
wipe off with lots and lots of clean paper towels .
lay plastic sheeting under the car so you don't make a total mess of the ground / floor .
if the hole underside and wheel houses are done you will go thru about 2 Gal. of preclean-o /900 .
on some cars when some dumb ass coated the hell out of the car with that crap we just remove all the chip guard right down to bare metal and start again .
it's 3 days labor to try and remove just the undercoating or a days labor to just remove the undercoating with the chip guard to bare then re chip guard every thing .
one problem is some times the black undercoating will stain the chip guard so even after you remove it the chip guard still will not have the OE look it should .
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