Re: Rock chips on fender
For the undercoat in rattle can, or any undercoating or spray in bed liner for that matter, the original paint - in this case under the fender - needs to be squeaky clean then roughed up with at least 220 sandpaper. It needs the "tooth" to adhere and stay there.
Did the underside of my fenders with rattle can undercaoting as per the instructions from a pro undercoater/bed liner friend. Looks great but have not had car out on the road yet.
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