Symptoms

The coating system shows localised
cracking, which results in loss of
adhesion and  flaking.

Cause

• Internal stresses of coating
  system
• Deformation or breakdown of
  the substrate e.g. joints opening, splits in the timber
• Unsuitable coating system
• Several layers are applied which are not   compatible
• Insufficient flexibility of applied paint
• Cracking originating from substrate
• Moisture on substrate at application

Solution

Coating layers that are not sound should be removed. After the right pretreatment, a new system should be applied. Touch up bare spots with Onol, Onol Express or Cetol BL Primer and finish with Rubbol AZ, Rubbol Satura or Cetol BL Opaque.