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@FloridaCruiser22 how many cans did it take for all four wheel wells?
Totally agree with this, I am currently working on my 94(fitting 39s )it has 280k miles on it, the under Factory undercoating is in perfect condition it's over an eighth of an inch thick.I have been using a wood chisel to Chisel it off. Zero rust underneath. Unless your rig saw tens of thousands of miles of gravel roads I don't know how this could wear off.Toyota used seam sealer. Like this,
View attachment 2250646
Chances of yours being toast are slim. It does blow up over time but I have stripped it off a truck with over 400,000 miles on it and there wasn’t much rust under it. To get it off you need to burn it and strip with a wire wheel. You can get seam sealer in brush on. It says softish which to me is best for rock hits.
I would top coat it with a color matched paint. Or you could do a high quality rubberized undercoating on it.
I wouldn’t put bedliner in the wheel well. It will chip out over time from rocks.
Cheers