NHTSA ID Number: 11016944
Manufacturer Communication Number: 19-NA-255
TSB/Document Date: 2025-04-10
Summary
This service bulletin provides frame coating repair information to correct a customer concern of wax coating on frame peeling, metal shows corrosion/rusting (U.S. and Canada Only).
Bulletin No.: 19-NA-255
Service Bulletin
Date: March, 2025
TECHNICAL
Subject:
Attention:
Brand:
Wax Coating on Frame Peeling, Metal Shows Corrosion/Rusting
This Bulletin also applies to any of the models that may be Export from
North America vehicles.
Model:
Model Year:
from
to
Escalade Models
2011
2025
Avalanche
2011
2013
2011
2025
2011
2018
2019
2019
Silverado 1500
2020
2021
Silverado 2500HD/
3500HD
2020
2025
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
2025
2011
2025
2011
2018
2019
2019
2020
2021
VIN:
from
Engine:
All
All
to
Express
Suburban
Tahoe
Silverado
Silverado 1500 (New
Model - 12th VIN Digit
= 7) - 4WD
Silverado 1500 (New
Model)
Silverado LD
Chevrolet
Silverado 2500/3500
Savana
Yukon Models
Sierra
GMC
Sierra 1500 (New
Model)
Sierra Limited
Sierra 2500/3500
Sierra 1500
Copyright 2025 General Motors. All Rights Reserved.
Page 2
Brand:
March, 2025
Model:
Bulletin No.: 19-NA-255
Model Year:
from
to
Sierra 2500HD/
3500HD
2020
2025
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
2025
Involved Region or Country
VIN:
from
Engine:
to
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
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
March, 2025
Page 3
2708906
2708908
Page 4
March, 2025
Bulletin No.: 19-NA-255
Van Example Photos
3396076
3396078
Bulletin No.: 19-NA-255
March, 2025
Page 5
3396079
3396080
Cause
The cause of this condition may be that the frame supplier may not have properly
prepped the metal before the wax coating was applied.
Correction
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:
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,
Page 6
March, 2025
Bulletin No.: 19-NA-255
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.
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
March, 2025
Page 7
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.
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.
Page 8
March, 2025
Bulletin No.: 19-NA-255
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.
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.
Bulletin No.: 19-NA-255
March, 2025
Page 9
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.
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.
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 10
March, 2025
Bulletin No.: 19-NA-255
3611143
14. Lower the vehicle and allow the final coat to dry as recommended by the manufacturer.
Bulletin No.: 19-NA-255
March, 2025
Page 11
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.
6191086
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.
Page 12
March, 2025
Bulletin No.: 19-NA-255
Version
10
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 Lifelong 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).
Revised January 18, 2024 – Updated Model Years.
Revised March 20, 2024 – Added Export Regions
Revised March 27, 2024 – Removed Australia and New Zealand.
Revised October 07, 2024 – Added 2025 Model Year.
Revised March 11, 2025 – Added 2025 GMC Sierra 2500/3500.
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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TSB/Document ID: 19-NA-255
Replacement Service Bulletin Number:
MFR Communication Date: 2025-03-11
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
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