I have used the 3M body schutz and thought it was harder than the original undercoating. I will say that my Chevelle is a daily driver and I have not noticed any flaking off.
I would really like to use the original formula of the brand name Rhino Liner bed liner, if I had a shop near me. That stuff wears great and had the feel and look of the factory applied undercoating, although it doesnt scrape off as easily.
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