Jump to content


Frame wax coating repaired under warranty

Recommended Posts

5 hours ago, Rock1500 said:

Do you just apply it over the areas or do you need to prep it first?

Sent from my Pixel 2 XL using Tapatalk

That depends.  If you have the problem described in the TSB, (areas of the wax not sticking to the chassis) GM recommends prepping the surface first.  I just apply the coating directly to the frame (after cleaning) for repairing small areas where the coating has rubbed off, ect..     

Share this post

Link to post
Share on other sites

When I bought my '17 last June, I did something that I normally wouldn't do; I paid a bunch of $$ for the undercoating.....('Trucoat'-...LOL). GM dealers here in Ontario sell an undercoating that goes on thick and only semi-dries. It won't come off from driving conditions like many other products do. It goes on right over the wax and doesn't cause any problems with it.

I had to get the installer to do it twice, because they did a poor job the first time. They didn't do much better the 2nd time & I had to show them how to do it properly....... Frustrating..

Later, I also bought some amber body oil & some black gel undercoat from another supplier & did all the interior panels, etc. (that the undercoat installer didn't do properly either).

I also sprayed the black gel over the 'undercoat' to keep it from drying out & also inside all the frame rails, suspension, axles, etc. 

During the winter I try to wash the undercarriage every month or so & again in the spring after the snow melts.

This spring I asked the dealer if I could buy some of the undercoating from them to do touch-ups etc. They sold me a can of it, which goes on a schutz gun. They only charged me $15.00 for the can. I already had a schutz gun at home, so no problem applying it. 
I went over everything this spring again to touch up etc.

After a year, the whole undercarriage still looks like new.

I'll just buy more of the 'Trucoat' from the dealer for future touch-ups.


I figure if I can keep it looking like that for 5-6 years, with a few hours of work each year, the truck will be worth several $'000 more to sell or trade when the time comes. Plus, it looks nice when everything is black and clean in the wheel wells etc. & also is a lot nicer to work on when everything isn't all rusty.

Edited by Nanotech Environmental
  • Like 1

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


Important Information

By using this site, you agree to our Terms of Use.