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Bleeching

Migration of pigment caused by the solvent in the new topcoat dissolving soluble dyes or pigments in the original fi nish, allowing them to seep into and discolour the new topcoat. Usually shown as a red or yellow discoloration on the topcoat, normally happens when spot repair with polyester putties.

Bleeching Bleeching
Bleeching
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Verursachen

  • Too much Peroxide in the preparation of polyester putties. This reacts with the subsequent layers of paint.
  • Migration of pigment from previous layers caused by the solvent of the fi nal layer.

Lösung

  • Prepare the mixture of the polyester putty, according to the specifi cation in the data sheet.
  • Use a sealing coat over the putty and allow to dry before applying any more coats.