Changing the colour of the coat due to a chemical reaction (peroxide harder in polyester putty with topcoat).

  • wrong proportions of hardener in polyester putty,
  • lack of sufficient insulation of polyester materials,
  • remains of tar and bituminous masses.
  • use appropriate proportions of hardener in polyester putty,
  • recommended insulation of polyester materials with epoxy primer,
  • before coating, remove the residues of bituminous masses and tar.
Sand and apply coat again.

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