COE Plasti-Dip is 'de debil!

I put Plasti-dip on my running boards while I figured out what I was going to do with them... Now that I've decided on color matched bedliner, I went to remove the stuff that is supposed to just peel off.... Yeah, not so much... 2 hours later using a board sander and DA and 1 of them is Plasti-dip free... 1 more to do. Live and learn...