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Corrosion creepback

Definition

Paint damage showing as irregularly shaped blister-like lifting of the paint surface.

Unterrostung

Causes

  1. Mechanical damage to the paint surface (e.g., stone chips, scratches) causing moisture to penetrate to the underlying coats or metal substrate
  2. Poor preparation of the metal before painting. Insufficient cleaning (see entry on ‘Blistering’). Poor derusting or poor removal of metal particles left on the surface from sanding
  3. Flash rust formation, for example, on newly sandblasted surfaces
  4. Inadequate or missing cavity sealing (rust perforation)
Unterrostung
Unterrostung
Unterrostung
20 x magnification

HOW TO AVOID

  1. Repair damaged paintwork immediately.
  2. Thoroughly clean the metal surface with Glasurit 360-4 Metal Cleaner. Remove all rust by sandblasting to produce a bare metal substrate. Tin all welded seams.
  3. Prime all sand-blasted areas immediately.
  4. Seal and protect all areas as recommended

REPAIR

Remove paint system and corrosion (rust) from the affected areas (by sanding, stripping, sandblasting). Clean the area again with Glasurit 360-4 Metal Cleaner and Glasurit 541-5 Wax and Silicone Remover. Refinish using the recommended undercoats and topcoats.