Don't Forget the Corrosion Protection
(Figure 1) Rail on left has no corrosion protection applied. The rail on the right has correct corrosion protection. Just because you can't see it, doesn't mean you don't need it. Think inside pillars, inside rocker panels, inside rails, in the bottom of door shell cavities, and on the backsides of panels. Can you name the corrosion protection material that is often overlooked?
That's right, it's anti-corrosion compound also known as cavity wax. This material is made to be applied to these areas on both steel and aluminum vehicles alike, and yes, it really is that important.
Take a look at Figure 1. A sectioning joint was made on both rails, then they were placed in a salt chamber. Engineers use a salt chamber to simulate real world environments in a short period of time. This test shows what could happen in approximately five years of driving conditions. It's not too hard to see which repair is the better quality and will stand the test of time. Which rail do you want your name on?
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Article validated in 2025
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General Motors Position Statement: Pre- and Post-Repair System Scanning
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