Corrosion creepback

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

Causes

1. Mechanical damage to the paint surface (e.g., stone chips, scratches) causing penetration of moisture to the underlying coats or metal substrate
2. Poor preparation of the metal prior to 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, e.g., on newly sand-blasted surfaces
4. Inadequate or missing cavity sealing (rust perforation)

HOW TO AVOID

1. Repair damaged paintwork immediately.
2. Thoroughly clean the metal surface with Glasurit 360-4 Metal Cleaner. Remove all rust by sand blasting 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.