our 65 gal had about 1/8~3/8 inch of ziebart under it- was the absolute messiest job I ever did...I used the rt angle grinder and knotted cup brushes, filthy/noisy...I was also going to do the bedliner, but after cleaning it off and etching it with Ospho to prevent rust under the paint, and putting a coat of POR15 primer on it, kinda liked the light blue, so just blacked out areas you could see like wheelwells/trunk floor, left the rest light...really brightens it up when working underneath.

Attached Thumbnails

     

______________________________________
Confidence: that feeling you have just before you realize the mess you've gotten yourself into...

http://www.hometown.aol.com/ford4v429/gal1.html