Defeitos e danos na pintura

501-36-21 Paint - General Information 501-36-21 DESCRIPTION AND OPERATION Formation of stripes Differing, stripe shaped color/effect formations in dark/light areas of a metallic paint finish. Cause/damage pattern: ‡ Spray gun (nozzle) not perfect. ‡ Incorrect spray pressure. ‡ Thinners not suitable. ‡ Incorrect spray viscosity. ‡ Flash-off time too short. ‡ Unsuitable working temperature. TO BE UPDATED LATER Repair of damage: ‡ Apply base paint evenly. ‡ Repair spray gun. ‡ After clear lacquer has thoroughly dried, sand surface and paint again. Peeling/blistering on plastic parts Paint adhesion insufficient between top coat and filler and/or primer layer. It often happens that the whole of the paint finish detaches from the plastic. Cause/damage pattern: ‡ Plastic item not cleaned sufficiently, not or inadequately tempered. ‡ Unsuitable cleaning agent used. ‡ Unsuitable materials used. ‡ Moisture. ‡ Paint finish underbaked or overbaked. ‡ Poor or lack of intermediate sanding. TO BE UPDATED LATER Repair of damage: ‡ Sand away faulty paint coats and re-apply paint finish. ‡ In extreme cases use a new part. Blistering on polyester material Color shade differences or marks in paintwork subsequently applied to previously unpainted plastic material. Cause/damage pattern: ‡ Plastic material is not suitable for painting. ‡ Incorrect bonding agent. ‡ Paint used not solvent resistant. Repair of damage: ‡ Repaint using suitable materials. ‡ Install unpainted new part (after consulting customer). Peroxide marks in metallic paints After longer period of drying, abnormal marks where the color shade varies. Cause/damage pattern: ‡ Too much hardener added to polyester stopper (over 3% can cause this damage pattern). ‡ Polyester stopper not well enough mixed.