CORROSION PROTECTION
Corrosion Protection Restoration
"Corrosion protection" encompasses all the materials and coatings which protect a vehicle from corrosion and
include:
• Coated steels
• E-coat primer on the complete body
• Body sealing to eliminate water and air intrusion where panels join
• Structural adhesives in some joints
• Chip resistant primer applications on the entire body
• Paint application
• Underbody corrosion protection
• Inner panel corrosion protection added to repair areas
Corrosion protection must be restored during a repair anytime it may have been compromised. All areas that have
been subjected to structural pulls, clamping, straightening, welding, or any other any other operation that may
have imparted damage to the corrosion protection system will need to be addressed.
In the repair process corrosion protection is addressed in three phases: pre-refinish, refinish and post-refinish.
Pre-refinish
In the pre-finish phase, structural adhesives, seam sealers and other applied coatings are installed. Sheet metal
seams are sealed to prevent water intrusion into the "dry" areas of the vehicle, such as passenger
compartment, and also to prevent intrusions of contaminates, such as water and road salt, into seams causing
corrosion. Lap joints, hem flanges, and any panel mating locations need to be addressed during the repair and
treated to duplicate the original vehicle build.
All bare metal should be epoxy primed prior to applying seam sealer, following the refinish material provider’s
instructions for doing so, unless the manufacture of the sealer specifically states otherwise.
When working around pinch weld flanges, seam sealer should be installed to duplicate the original appearance and
function. If it is unclear whether the original sealing material between the flanges is strictly a sealer or structural
adhesive, always default to a structural adhesive such as LORD Fusor 2098, LORD Fusor 112B, or 3M 08116. For
additional information related to weld-bonding and welding around adhesives and sealers, (Refer to 31 - Collision
Information - Standard Procedure).
Roof and closure panels will require the use of anti-flutter foam. Where inner panel supports meet external panels,
the proper replacement materials in these areas are Mopar part No. 04864015AB, or equivalent, or LORD Fusor
121, or 3M 04274 Noise Vibration Harshness (NVH) dampening material.
Any disturbed or removed NVH foam needs to be replaced. Use Mopar part No. 05142864AA, LORD Fusor 130, or
3M 8463.
All hem flanges on closure panels should be sealed whether sealer is apparent or not. This includes those disturbed
during the repair, and those on new replacement panels. Either duplicate the existing bead in shape or size, or
where one is not obvious, seal the hem flange in a discrete fashion. Hem flanges should be sealed using Mopar
part No.04318026, LORD Fusor 129, or 3M 08308.
Lap joints, such as in floor pans, should be sealed to duplicate the sealer visible, but also addressed on any exterior
surface by sealing the lap wether visible or not.
NOTE: FCA US LLC does not recommend the use of any type of (weld-thru( primer during repairs. Weld-
bonding with corrosion protecting adhesives or sealers, along with final application of inner panel
corrosion protection is the proper method.
Refinish
All painted surfaces should be coated using a FCA US LLC approved refinish material. The refinish process
includes application of undercoats, primers (filler & sealer), basecoats and clearcoat. These approved materials
have been tested to the same material standards as the production materials.
Post-refinish
All new panels, and repair areas, must have inner panel corrosion protection applied after the painting operation is
complete, but before all the trim is reinstalled. Mopar Cavity Wax No. 68042970AA, or 3M Rustfighter
31 - 52 31 - Collision Information RU
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