19NA255

Service Bulletin
Bulletin No.:
19-NA-255
Date:
July, 2020
TECHNICAL
Subject:
Wax Coating on Frame Peeling, Metal Shows Corrosion/Rusting
(U.S. and Canada Only)
Attention: This Bulletin also applies to any of the models that may be Export from North America
vehicles.
Brand:
Cadillac
Chevrolet
Model:
Model Year:
from
to
Escalade Models
2011
2020
Avalanche
2011
2013
Express
Suburban
Tahoe
2011
2020
Silverado
2011
2018
Silverado 1500 (New
Model - 12th VIN Digit
= 7) - 4WD
Silverado 1500 (New
Model)
Silverado LD
Silverado 2500/3500
2019
2019
Silverado 1500
2020
2020
Savana
Yukon Models
2011
2020
Sierra
2011
2018
Sierra 1500 (New
Model)
Sierra Limited
Sierra 2500/3500
2019
2019
2020
2020
Silverado 2500HD/
3500HD
GMC
Sierra 1500
Sierra 2500HD/
3500HD
Copyright 2020 General Motors LLC. All Rights Reserved.
VIN:
from
Engine:
Transmission:
All
All
to
Page 2
Involved Region or Country
July, 2020
Bulletin No.: 19-NA-255
North America, Europe, Middle East, Israel, Palestine, Chile, Columbia, Ecuador,
Paraguay, Peru, Uruguay, Japan, S Korea, China, Taiwan, Thailand, Africa and Egypt.
Additional Options (RPOs)
Some customers may comment that areas of the frame wax coating are peeling off and
rust/corrosion is visible on the metal in these areas. Several examples of this condition
are shown in each group of graphics below.
Truck Example Photos
Condition
2708901
2708906
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July, 2020
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2708908
Van Example Photos
3396076
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July, 2020
Bulletin No.: 19-NA-255
3396078
3396079
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Cause
Correction
The cause of this condition may be that the frame supplier may not have properly
prepped the metal before the wax coating was applied.
Note: A combination of specialized metal coating products manufactured by Lloyds and
Daubert have been found to be the most suitable products to provide corrosion control
and protection to address this type of repair. Our recommendation is to prep the metal
surface using *Lloyd’s Pure Prep™ Metal Surface Preparation P/N 25418, then topcoat
with both *Lloyds Kryptonite Metal Treatment P/N 36502 Life Long Rust Protection and
*Daubert Non-Rust® P/N X-121B One Coat Rust Preventative Coating. It is strongly
recommended they be applied according to the manufacturer’s procedures.
*We believe this source and their products to be reliable. There may be additional
manufacturers of such products/materials. General Motors does not endorse, indicate
any preference for, or assume any responsibility for the products or material from this firm
or for any such items that may be available from other sources.
Prep the frame and apply the Lloyds and Daubert coatings following the steps in the
Service Procedure below:
Service Procedure
Important: To ensure proper coating performance, all
of the manufacturer’s “Applications Guidelines” MUST
be followed.
Note: The graphics below show the bed and/or cab
removed from the vehicle. These pictures are provided
for reference only. Bed and/or Cab removal are not
necessary. Dealers should only repair the locations that
show the condition. The following procedure should be
utilized to return the truck to a factory look.
1. Raise and suitably support the vehicle. Refer to
Lifting and Jacking the Vehicle in SI.
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July, 2020
2708909
2. If labels are in the area to be reworked, remove
any of the visible white labels on the frame (usually
one per side).
3. Remove any components as required to gain
access to the corroded component or area.
Important: Any corrosion damage noted to the extent
of weakening the component will require component
replacement.
4. Determine a start and finish point on each side for
the section/area of the frame to be repaired.
Bulletin No.: 19-NA-255
2708911
Important: Lloyds Kryptonite is designed to apply
directly onto brown rust or clean surfaces; however any
loose flakes/scale of rust need to be removed prior to
application.
6. Any loose rust or loose flakes should be scraped,
wire brushed or ground off.
7. Remove any residual wax, oil or rust by wiping the
frame down with a towel or Scotch-Brite™ (3M)
pad soaked with wax/grease remover.
3611135
3611133
5. Using a rag and wax/grease removing solvent,
remove the wax coating and any grease, oil, or
undercoating from the truck frame in the affected
repair area. The graphic above shows an example
of a small portion of the wax coating removed.
8. Using Lloyd’s Pure Prep™ Metal Surface
Preparation P/N 25418 (10 fluid ounce bottle), or
equivalent, saturate a towel or Scotch-Brite™ (3M)
pad with the pre-diluted solution and scrub the
area well, rendering a foaming of the Pure Prep.™
This will greatly improve adhesion and corrosion
resistance in the repair areas.
Bulletin No.: 19-NA-255
July, 2020
2708913
Important: The frame must be dry and free of wax/oily
substances prior to application of the new coating.
9. Using a water dampened clean towel, remove any
residue and dry the affected area. Dry the repair
area completely using an air hose to blow dry the
frame.
10. Check the repair area for phosphate treatment by
wiping it to see if any corrosion residue can be
picked up. Correctly treated areas will not have any
residue on the surface.
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3611139
12. Apply a second coat of Lloyds Kryptonite. This can
be a heavy coat; double and triple passes with this
product, over a light first coat, are not a problem.
Note: Dried Lloyds Kryptonite will perform beautifully
over time and actually get harder and more durable as
it experiences heat.
3611142
3611138
11. Apply a light flash-coat of Lloyds Kryptonite Metal
Treatment P/N 36502 Life Long Rust Protection
(14 ounce aerosol), or equivalent, to all rusted and
bare areas of the frame where the wax coating was
removed. This first coat should flash in
approximately 3-5 minutes.
13. We suggest top coating the Lloyds Kryptonite with
Daubert Nox-Rust® P/N X-121B “One Coat Rust
Preventative Coating” (aerosol), or equivalent.
Note: As shown in the graphic below, besides adding a
corrosion resistant layer, it dries to firm, wax-like film
which will more closely resemble the appearance of the
unrepaired areas of the frame.
Page 8
July, 2020
3611143
14. Lower the vehicle and allow the final coat to dry as
recommended by the manufacturer.
Parts Information
Dealers should obtain 25418 and 36502 by contacting
Lloyds by e-mail at [email protected], or
by calling 1-800-361-6766.
U.S. Dealers can obtain the X-121B topcoat by
contacting the Daubert website at
www.daubertchemical.com or inside the U.S. only, by
calling 1-800-914-0034.
Canadian dealers must contact the Daubert
distributor in Canada, Corrosion Control Coatings
Ltd, by faxing the form below to 1-800-563-8078.
Important: ONLY Canadian Dealers should use
this form.
Bulletin No.: 19-NA-255
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July, 2020
Bulletin No.: 19-NA-255
Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation,and include material cost.
Reference the Applicable Warranties section of
Investigate Vehicle History (IVH) for coverage
information.
Labor
Operation
Description
Labor
Time
1480098*
Remove Frame Wax, Apply
Metal Coating
Up to
7.0 hrs
*This is a unique Labor Operation for Bulletin use only.
Version
2
Modified
Released November 18, 2019
Revised July 22, 2020 – Added 2019 and 2020 T1 Pickup Models.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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