Coating

Chipping

Fragments of the coating falling off in patches - poor adhesion between layers, poor surface preparation or inappropriate paint system.

Poor adhesion between layers - the varnish chips off in patches instead of in spots
The top layer is too hard and brittle compared to the other layers of the system
Incorrect selection of primer for the substrate - especially a problem with galvanized steel and aluminum
Insufficient degreasing of the substrate before painting
Sandpaper with too smooth gradation - too smooth a surface reduces mechanical adhesion
Failure to observe flash-off times between layers
Thinner too fast causing dust or condensation
Poor paint system not suitable for the given substrate
No elasticity additive when painting plastic elements - bumpers and other plastic elements work and bend while driving, stiff paint cracks and chips with each bending
Incorrectly selected primer for plastics - some plastics (PP, TPO) require a special adhesive primer, without it the varnish has no mechanical adhesion

Use primers and fillers in accordance with the technical data sheet and the substrate
For plastic elements, use 2K flexible systems
Degrease only with recommended cleaners and clean cloths
Wash the element with warm soapy water before degreasing - remove all contaminants
Sand the edges of the repaired area with appropriate grit paper
Observe the evaporation and drying times specified in the technical data sheet
Apply layers of recommended thickness under appropriate pressure
Use the appropriate diluent taking into account the temperature and operating conditions
Always use a dedicated plastic adhesion primer on plastic elements before painting
Add a flexible agent to varnishes for bumpers and flexible elements in the proportions specified in the technical data sheet - the flexible varnish works together with the substrate instead of cracking
Remember that different materials (PP, ABS, TPO, PC) require different preparation systems - always identify the type of material before selecting products

Repair small chips as soon as possible before corrosion destroys the substrate and the paint system
Minor damage: touch-up with a brush - clean, prime, cover with base and clear coat
Extensive chipping requires full preparation of the substrate and re-coating of the entire element
After repair, check the adhesion of the system - if chipping occurs regularly, the problem lies in the preparation of the substrate
When repairing plastic elements, always use a system with a flexible additive - repairing the standard system on the bumper will end with another chipping at the first deflection of the element