Base Paint Structure
Galvanized Sheet Metal on both Sides
Previous attempts to match flanges have led to the use of only galvanized sheet metal on both sides. Only here do the cathodic protection and the zinc coating barrier effect work optimally together. The cut edges that are poorly protected with paint (thinning edges) are additionally protected.
Make sure that
All metal edges are properly deburred when performing a body repair.
the zinc and cataphoretic layer is completely present on the interior surfaces that are not painted.
The inner weld flange and the sanded-through areas are reworked with Inox Spray:D 007 600 A1 or zinc spray.
Smoothing Work
To reestablish the contour of the body surfaces, the smoothing materials today in body construction and in the paint finishing system are considered to be essential. Pay attention to the different preparations for the base surface.
- The metal filling paste requires a base that is bare metal and is as coarse as possible. The best adhesion and anti-corrosion properties can be best achieved with the Pneumatic Brush Grinder Set:VAS 6446A .
- Spray and polyester filler paste acts as a hydrophilic. That means they absorb moisture like a sponge. Therefore the bare metal surfaces must be insulated. The Two-Part Wash Primer:LHV 043 000 A2 and then the Two-Part HS-Performance Filler are used as insulation before the filler paste.
Product Information:
- Refer to FILLING PASTE
Primer
The primer is the most important component of the corrosion protection system, because it prevents water and oxygen from accessing the metal surface. Original replacement parts are normally coated with a black or gray cataphoretic dip coating (CDC). The primer type is dependent on the area of application.
- The cataphoretic primer is not UV and acid resistant. Body components that are in the areas that are at risk, such as the front end, fenders and wheel housings must then also be coated from the inside with a spray of base coat and clear coat. On inner-lying body surfaces, such as on the roof or side panels with a complete trim panel, it is sufficient if cracks and bare surfaces are sealed with glass/paint primer. In case of doubt, the production status applies.
- When body parts that have been worked on are delivered, watch out for any rust film. Cleaning or intermediate sanding may be necessary.
- Sanded-through areas or weld seams must be recoated as quickly as possible with corrosion protection.
Areas sanded through to the base surface (bare metal) and that have had corrosion repair are to be primed with Two-Part Wash Primer:LHV 043 000 A2 and then filled with Two-Part HS Performance Filler.
Make sure when treating the Two-Part Wash Primer:LHV 043 000 A2 that it is always mixed again before the application, and that a dry coat thickness of at least 10-12 μm has been reached.
Product information:
- Refer to PRIMER METAL
- Refer to PLASTIC PRIMER
Filler
The filler contributes to corrosion protection to a lesser extent. A suitable filler is, however, essential in service.
Tasks:
- Filler protects the body from stone impact. Therefore pay attention to the appropriate layer thickness in the stone chip protection area.
- Filler serves as surface preparation. Sanding scratches can be smoothed out.
- Colored filler improves the coverage of colors with poor covering properties.
Product information:
- Refer to FILLER
PVC Sealed Seams and Underbody Protection
When repairing, the seam sealant is to be returned to replicate stock visual appearance and layer thickness.
Sealing seams near attachments to be installed must be applied smoothly in order to avoid damage and malfunctions.
Water drain holes must stay clear.
All threaded pins and weld nuts with M-threads, as well as all other pins and contact surfaces for the assembly must be functional after the sealant application.
The sealing material cannot be applied on blank sheet metal, but rather on filled surfaces.
To prevent any water from entering the flange, the notch is sealed with paste-like, solvent-free PVC in critical areas on the body. A PVC coating of different thickness is sprayed on specified areas on the underbody and in the wheel housings to protect against stone impact and engine humming.
After a corrosion repair, insulate the bare metallic base surface with Two-Part Wash Primer:LHV 043 000 A2 and then fill with Two-Part HS Performance Filler.
For the underbody protection, pay attention to the specified layer thickness.
Product information:
- Refer to UNDERBODY PROTECTION
- Refer to STONE CHIP PROTECTION
- Refer to SEALING MATERIALS
Base Paint
For the base coat, the decorative application is the main consideration. This contributes to corrosion protection to a lesser extent.
Depending on the pigment content, the colors have different coverage. Observe the manufacturer's instructions.
Product information:
- Refer to TOP COATS
Clear Coat
For the clear coat, the decorative application is the prime consideration. The clear coat also contributes to corrosion protection to a lesser extent. The clear coat protects the top coat/base paint against UV radiation and environmental pollution such as acidic bird droppings.
Product information:
- Refer to CLEAR COATS
Conservation wax
The conservation wax/cavity sealants play a decisive role for corrosion protection. Depending on the area of application, different materials are available in service. The exceptional protective effects of these materials is based on the following characteristics:
- hydrophobic (water repellent)
- good adhesion
- no rust formation
- water vapor permeability approximately 1, 500 times lower than with a paint coating of the same thickness
Product information:
- Refer to PRESERVATION
- Refer to WAX UNDERBODY PROTECTION