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Old 02-17-2020, 04:39 PM   #1
Davew
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Default Rock chips on fender

When I put the car away last fall I noticed some small star shaped rock chips on the front fenders. I live on a mile and a half of gravel road and the tires are picking up rocks and causing the problem.. Does anybody use bed liner or ? under the fenders to stop this... would like to do something this spring.. Hate to move to town...Thanks
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Old 02-17-2020, 06:25 PM   #2
d.
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Default Re: Rock chips on fender

I used some brush on undercoating I got at the local chain auto chain store and it works well...It has been fine for 30 years now.
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Old 02-17-2020, 07:08 PM   #3
Davew
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Default Re: Rock chips on fender

I have been looking at some of that. Rhino liner and others. Didn’t know if it would stay.
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Old 02-17-2020, 07:14 PM   #4
daren007
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Default Re: Rock chips on fender

3M spray on undercoating.
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Old 02-17-2020, 08:27 PM   #5
duke36
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Default Re: Rock chips on fender

If you have a compressor, I use 3m Body Shutz (per post 4) when applied with an undercoating nozzle. Some versions can be painted or left as applied.
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Old 02-18-2020, 02:13 AM   #6
J Franklin
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Default Re: Rock chips on fender

You can buy undercoat spray in rattle cans.
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Old 02-18-2020, 07:45 AM   #7
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Default 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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Old 02-18-2020, 11:51 AM   #8
Roger V
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Default Re: Rock chips on fender

Quote:
Originally Posted by Davew View Post
star shaped rock chips
Do you have fiberglass fenders? They are notorious for star shaped cracks/chips. They are good for undercoating to adhere to as the bottom side is typically rough with fiberglass strands. Need a thick coat or multiple coats though.
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Old 02-18-2020, 03:23 PM   #9
Davew
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Default Re: Rock chips on fender

My fenders are metal...there seems to be a lot of different products. just to pick one. I have access to a compressor so maybe that 3m stuff. ?
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