UNDERBODY COATING THEORY
Under Body Coating is a plastisol that is a shear thinning paste , which is applied to the vehicle in te paint shop. this coating applied on the underside of the vehicle and in the wheel wells. once curing is complete in the paint-shop ovens. coating becomes semi-elastic / solid that resist corrosion and abrasion.
Underbody coating resist the damage caused due to
- Environmental conditions
- Impacts
- Dampens sound and vibration
- Insulates against cold and heat
- Protects against Corrosion
- Seals off seams
- Hides welds, repairs & bodywork with spray
Process of Underbody Coating
A sealant is applied around and inside the doors, hood, trunk, and front dash, and onto the exterior and interior of metal joints and outer area of the back wheel.
PVC and acryl/urethane sealants have also been used in the underbody areas, a process called the Dampening Coat (DC), to impart noise‐proofing and vibration‐deadening. The noise and vibration are transferred from the engine, drive train, suspension system, road noise of the tires, and flowing air, and the underbody sealants reduce noise transfer into the passenger compartment of the automobile . The underbody coating also provides anti‐corrosion and chipping protection; typically, it is accomplished using robots equipped with airless sprayers.
the lower door sections and rocker panel locations where PVC or urethanes are
applied as an anti‐chipping protection, and shows the cross section of this layer with respect to the other coatings on the body parts .
A soft tip primer coat is also applied that improves the chipping resistance (resistance against chipping by flying stones or debris). This layer is applied to the front
edge of the hood, which is an area prone to chipping shock, using a high elastic resin that resides between the ED and primer coats.