Perfect preparation of the subsurface is the precondition for a brilliant paintwork result. Faults in the preliminary stages delay completion and cause unnecessary extra work. The working steps described here demonstrate how important it is to follow these instructions step by step.
NOTE: Thorough cleaning of the vehicle and especially of the area being repaired is particularly important because of the danger of contamination of the paint.
Clean the area of the damage
Clean the damaged surface thoroughly, to allow the extent of the damage to be seen. Use silicone remover to produce a grease-free surface.
NOTE: The treated surface must be rubbed with a clean dry cloth before the solvent evaporates, otherwise there will be no cleaning effect.
Effective de-greasing is important not only before the application of paint, but also before all sanding stages, for two reasons:
Establish the area of damage and the repair stages. In doing so, establish how much disassembly work must be undertaken. Perform a color test at this stage.
Mask off the area of the repair ready for preparatory work.
Sand out the damage location
When sanding, produce smooth transitions from the painted area to the bare metal.
Use an eccentric sander and P80 or P120 abrasive sheets. Finish off sanding with P150 or P180. The remaining adhering sanding dust must be completely removed.
Cleaning, de-greasing
Use silicone remover to thoroughly clean the surface in order to remove grease residues, sweat from the hands and other contamination.
NOTE: Use a solvent test to establish whether the old paint can be etched. Apply 2-component thinners to the damaged area using a clean cloth and rub lightly for about 1 minute. If the subsurfaces can be etched away, special pre-treatment is necessary. See "Tips and Tricks"
Apply primer filler
Before applying stopper, apply primer to the sanded and bare surface.
Allow the primer to dry and then lightly sand by hand using P220 - P400 dry.
NOTE: Most stopper can be applied directly to bare metal. But application of a primer filler provides better corrosion protection.
NOTE: Avoid sanding through to the bare metal.
Points which are sanded through must be retreated with primer filler.
Stopper application
Pre-sand the hardened stopper using an eccentric sander and P80 dry, then final-sand using P120 - P140 dry. Clean the sanded surface using silicone remover.
Apply 2-component stopper to the filled surface.
The stopper compound must only be applied thinly.
NOTE: Use of a testing powder is recommended so that the sanding process can be more easily checked.
Apply filler
Filler can now be applied to the dried repair area.
Choose the correctly toned filler according to the manufacturer's instructions.
NOTE: Alternatively, filler with the correct tone can be mixed with the aid of colour matching cards.
Sand the filler.
The working area is expanded by applying new masking. This makes it possible to even out the transition from the damage area to the vehicle paintwork.
NOTE: The primer filler must be carefully sanded.
Faults in the primer filler layer will be visible in the top coat.
The sanding process consists of two stages.
Coarse sanding levels out the surface of the filler primer. Fine sanding ensures the necessary surface structure which allows the top coat to adhere well and cover sanding marks.
Sand the filler using the eccentric sander and P400 - P500 used dry. Clean the sanded filler finished surface using silicone remover.
The painted area is matted using a fine matting sponge, and then thoroughly cleaned.
Surface ready for paint
The surface which has been repaired and then prepared according to the manufacturer's instructions is now ready for basic paint application.