whats with the coating GM uses on there frames?
 

Man that stuff is a mess. Is it better than paint? I know it comes off fairly easy. Anyone know what the deal is with that stuff?

Yeah I knocked a shit load of it off when I was rpessure washing the engine bay since the motor is out I was surprised how easy it came off. Should I get soem undercoating shit from hoem depot or soemthing to cover up the bare spots?

I did the same thing while cleaning my engine bay. All I did it get some high temp black rustoleum from the hardware store, and painted the frame again after it dried, and that paint has yet to come off!

found this:

The original anti-corrosion coating on most frames is a wax. The entire frame is dipped in hot wax, leaving an average 4 mil thick coating that's highly resistant to salt and moisture. Hot wax is favored over electrodeposition coating (E-coat) on frames for several reasons. The E-coat process requires the metal to be extremely clean, and the cleaning process is not easy on a full size frame part. Also, the heated wax flows into the many enclosed areas and corners of a frame easier than E-coat, which only adheres to areas that are electrically charged. Finally, the hot wax process is four times less expensive than the E-coat process.

for frame touch-ups

http://www.i-car.com/graphics/about_...size/fig_5.jpg

General info:

Hot melt wax coatings are thermoplastic corrosion
prevention compounds. They have a solvent or
waterborne formulation. Since the 1970’s, hot melt
waxes have been used extensively on underbody
structural components to provide corrosion protection
and enhance vehicle durability. Hot melt
waxes are usually applied through a dipping
process. The wax is preheated to a temperature
between 125 and 195 degrees C (257 and 383
degrees F). Following an alkali cleaning and water
rinsing operation, parts are immersed in the
molten wax. The thickness of the wax deposited
on the parts is controlled through a preheat of the
parts prior to dipping and the actual time of
immersion in the hot melt wax. Following the
immersion process, the coated parts are allowed
to return to ambient temperature through a
process that controls the uniformity and finish of
the hot melt wax. Hot melt wax thickness is
commonly specified as 75-125 micrometers
(3-5 mils). Typically, hot melt wax coatings can
withstand temperatures up to 143 degrees C
(290 degrees F) without dripping.


http://www.a-sp.org/database/custom/...Protection.pdf

Product Number: 178660
Product Description: Nox Rust X-121B
ECP Inc.
333 Burr Ridge Parkway
Burr Ridge, IL 60521 Suite # 200
Toll free (USA & Canada) 1-800-323-3521 or 1-630-203-6800
Via Fax # 1-800-409-5195
web site: www.ecpinc.net

what? no ones interested in this info? :jest:

SO post 7 is what I need to get right to touch up ALL the damn bare spots?

Im interested:D

affirmative :usa: