Have you been offroading in that 2500hd?
Scraping off a little wax?

Seriously, what are you doing?

 

That wax can also catch fire via a welder. Don't ask, just know it wasn't me. I usually wind up using Krylon semi-flat black, looks perfect, not too glossy or too dull.

 

thanks for posting the aeresol stuff. my coating came off once the transfer case seal blew and grease all over the underside of the frame. now i know what to recover it with.

 

i use 3M undercoating. cody i can prob. ****** some for you if you need it when i send the covers back

 

Yea, the stuff they coat the frame with comes off real easy...a few years back I was chasing a squeak from my suspension and spraying some lubricant around the left front upper shock mount and the coating came right off. (squeak turned out to be the upper shock mount...got it replaced under warranty). Not too long afterwards I started to noticed the nice orange glow of rust. I bought a small can of POR (Paint Over Rust) and followed the directions and so far so good

The other day I noticed the coating coming off inside the tubes that run from one frame rail to the other, under the bed

 

The frames are supplied by Magna International. GM decided to do a cost save several years back and made a boner decision to source the frames to sweat shop labour and the proposed coating was ......... you got it "wax". The previous coatings were much more robust. If you live in areas with snow and ice always get the aftermarket coating year after year.

 

mine came off with a little coolant spill, i used duplicolor truck bed coating in the spray can iand it matched and worked perfectly, also coated my diff!

 

has any one bought any of this?

 

Mine came off easily as well. Just took a big turbo charger and that crap melted right off (all over the spare tire).

Go GM!

 

great info I took my hitch off last week to put on my shackles and noticed the undercoating squirted out between the hitch and frame and now there are 3 bare spots on each side of the frame were the hitch mounted up against Ill have to pick up a can of that stuff.