Rust

Definition

Paint damage showing at the paint surface as irregular shaped blisters.  If the blisters burst then corrosion spots are clearly visible (e.g. brown rust on steel or white rust on aluminium).

Causes

1] Mechanical damage to the paint surface (e.g. stone chips, scratches etc.) causing penetration of moisture to the underlying coats or metal substrate.

2] Poor preparation of the metal prior to painting. Poor cleaning (see also chapter on "Blistering"). Poor rust removal or removal of metal particles from the metal surface..

3] Flash rust formation on newly stripped or sand blasted metal surfaces..

4] Inadequate or missing cavity sealing. (Rust through from behind)..

How to avoid

1] Stone chips or scratches should be repaired immediately.

2] Ensure through cleaning of all metal surfaces with Glasurit Metal Cleaner 360-4.  Remove all rust by sand blasting to produce a bright metal substrate. Tin all welded seams

3] Sandblasted areas should be primed immediately after blasting to avoid flash rusting

4] Seal and protect all cavities with the recommended products.

Repair

Remove all paint and corrosion (rust) from the affected areas (by grinding, stripping, sandblasting). Thoroughly clean the area with Glasurit Panel Cleaner 360-4 and Glasurit Wax and Grease Remover 541-5. Prime bare metal as quick as possible to avoid flash rusting and build up with the ecommended primers, surfacers and top-coats.