Body General body information and techniques for restoration, repairs, and modifications.

How To Undercoating/Rust Prevention?

Old 02-26-2019, 09:06 AM
  #1  
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Join Date: Aug 2012
Location: MI
Posts: 7
Car: 1991 Z28
Engine: 350
Transmission: 700r4
Axle/Gears: 12 Bolt Moser - 3.42 w/ TruTrac
How To Undercoating/Rust Prevention?




Curious if anybody has any tips, tricks, or guides on how I can preserve this in its state. With the little rust it has I'd like to descale it and undercoat it but not sure how to go about it.
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Old 02-26-2019, 05:53 PM
  #2  
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Join Date: Jul 2011
Location: Springfield,Illinois
Posts: 479
Car: 1987 TA GTA, 1987 IROC 1988 Formula
Engine: 350 tpi/305 tpi/350 tbi
Transmission: All have 700r4's
Axle/Gears: 10 bolt with 3:73's
Re: How To Undercoating/Rust Prevention?

You'll want to strip the paint off anywhere you see rust bleeding through. Its probably gonna snowball by the looks of it so be prepared to spend some time under it with a angle grinder, etc. After you have most of the paint removed you can scrub it with a red scotchbrite pad and ospho. 2-3 coat should get it. Seal it up with primer and paint. Most suggest a epoxy primer and paint but I just recently used rustoleum self etch primer and their high performance enamel.
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Old 02-27-2019, 11:05 AM
  #3  
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Join Date: Jun 2002
Location: North East GA
Posts: 1,871
Car: 1989 Firebird
Engine: 5.7 LS1
Transmission: T56
Re: How To Undercoating/Rust Prevention?

Dry ice will help remove the under coating typically, never tried it on a third gen though. Just don't freeze burn your self.
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Old 02-28-2019, 09:17 AM
  #4  
Junior Member
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Join Date: Aug 2012
Location: MI
Posts: 7
Car: 1991 Z28
Engine: 350
Transmission: 700r4
Axle/Gears: 12 Bolt Moser - 3.42 w/ TruTrac
Re: How To Undercoating/Rust Prevention?

Awesome! Appreciate the tips guys. I know on the main body it'll surprise you every time. Never done underbody work.
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