19-NA-255

Bulletin No.:
Service Bulletin
Date:
19-NA-255
November, 2022
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:
Model:
Cadillac
Model Year:
from
to
Escalade Models
2011
2023
Avalanche
2011
2013
2011
2023
2011
2018
2019
2019
VIN:
from
Engine:
Transmission:
All
All
to
Express
Suburban
Tahoe
Silverado
Silverado 1500 (New Model 12th VIN Digit = 7) - 4WD
Silverado 1500 (New Model)
Chevrolet
Silverado LD
Silverado 2500/3500
Silverado 1500
2020
2021
Silverado 2500HD/3500HD
2020
2023
Silverado 1500 LTD (RPO
J21, VIN Digit 5 = W / Y)
2022
2022
Silverado 1500 New (RPO
J22, VIN Digit 5 = A / D)
2022
2022
Silverado 1500
2023
2023
Copyright 2022 General Motors LLC. All Rights Reserved.
Page 2
Brand:
November, 2022
Model Year:
Model:
from
to
2011
2023
2011
2018
2019
2019
Sierra 1500
2020
2021
Sierra 2500HD/3500HD
2020
2023
Sierra 1500 Limited (RPO
J21, VIN Digit 5 = 8 / 9)
2022
2022
Sierra 1500 New (RPO J22,
VIN Digit 5 = H / U)
2022
2022
Sierra 1500
2023
2023
Savana
Yukon Models
Sierra
Bulletin No.: 19-NA-255
VIN:
from
Engine:
Transmission:
All
All
to
Sierra 1500 (New Model)
Sierra Limited
Sierra 2500/3500
GMC
Involved Region or Country
North America, Europe, Middle East, Israel, Palestine, Chile, Columbia, Ecuador,
Paraguay, Peru, Uruguay, Japan, S Korea, China, Taiwan, Thailand, Africa and Egypt,
Russia, Uzbekistan, S. Africa, Australia and New Zealand.
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
Bulletin No.: 19-NA-255
November, 2022
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2708906
2708908
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November, 2022
Bulletin No.: 19-NA-255
Van Example Photos
3396076
3396078
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November, 2022
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3396079
3396080
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 36500 High Temp Satin Black 455
ml (16 oz), 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:
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November, 2022
Bulletin No.: 19-NA-255
Service Procedure
Important: Important: Service agents must comply
with all International, Federal, State, Provincial,
and/or Local laws applicable to the activities it
performs under this bulletin, including but not
limited to handling, deploying, preparing,
classifying, packaging, marking, labeling, and
shipping dangerous goods. In the event of a
conflict between the procedures set forth in this
bulletin and the laws that apply to your dealership,
you must follow those applicable laws.
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 the Service
Manual.
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.
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.
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.
Bulletin No.: 19-NA-255
November, 2022
3611135
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.
Page 7
3611138
Note: For application of the Lloyds Kryptonite P/N
36500, it can be sprayed, rolled, dipped or painted.
11. To retain corrosion protection, apply a light coat of
Lloyds Kryptonite™ Metal Treatment* - P/N 36500
High Temp Satin Black 455 ml (16 oz), 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
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.
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.
3611142
13. We suggest top coating the Lloyds Kryptonite with
Daubert Nox-Rust® P/N X-121B “One Coat Rust
Preventative Coating” (aerosol), or equivalent.
Page 8
November, 2022
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.
3611143
14. Lower the vehicle and allow the final coat to dry as
recommended by the manufacturer.
Parts Information
Dealers should obtain 25418 and 36500 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
Bulletin No.: 19-NA-255
November, 2022
Page 9
6191086
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November, 2022
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
5
Modified
Released November 18, 2019
Revised July 22, 2020 – Added 2019 and 2020 T1 Pickup Models.
Revised March 10, 2021 – Added 2021 Model Year.
Revised February 07, 2022 – Added 2022 Model Year
Revised November 07, 2022 – Added 2023 Model Year and Because Lloyds Kryptonite
Metal Treatment P/N 36502 Life Long Rust Protection is No Longer Available we Updated
the Product to Lloyds Kryptonite™ Metal Treatment* - P/N 36500 High Temp Satin Black
455 ml (16 oz).
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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