2020HD Chassis Coating

C/K Man · April 1, 2020

Someone told me GM has changed or is about to change the frame coating from the wax-based NoxRust to an E-coat. Don't know that I believe that yet. Anyone know for sure?

mkeddie · April 2, 2020

Don't know that they have but when I called ziabart they said that Chevy was going away from the wax coat so now it's easier for them to undercoat

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redwngr · April 2, 2020

Dipping in wax gets the coating on the inside of the frame as well.

Not sure how easy it would be to get e-coat coverage on the inside.

(no saying impossible, but wondering what the process would be)

C/K Man · April 3, 2020

I think E-coat usually involves dipping as well. But yes, the wax dip protects the inside of the boxed frame rails very well. That's why GM trucks didn't break in half like Toyota's did!

redwngr · April 3, 2020

C/K, you are correct. I must have been thinking about powder coat rather than e-coat.

https://www.sharrettsplating.com/blog/e-coating-vs-powder-coating/

Edited April 3, 2020 by redwngr

C/K Man · April 4, 2020

I think one of the reasons Silverado medium duty trucks are E-coat paint because upfitters don't like the messy wax.

I bought a 1993 GMC C2500 brand new and it seemed like the frame got the wax dip twice. Truck smelled like crayons and when it got hot the first couple of times some of that goo melted a made a mess in the street. Truck is still on the road and the frame never rusted.