Defeitos e danos na pintura

501-36-20 Paint - General Information 501-36-20 DESCRIPTION AND OPERATION adhesion defects can only be noticed after an external influence such as stone impact. Cause/damage pattern: ‡ Substrate not adequately prepared (rust, grease, moisture, sanding, cleaning). ‡ Unsuitable material used. ‡ Drying times, flash-off times too short. ‡ Base paint not sprayed wet-in-wet, instead the intermediate drying times were too long. ‡ Failure to intermediate sand. ‡ Condensation formed because of temperature fluctuations. ‡ Unprofessional preparation (especially on plastics). ‡ Overheated CDP/intermediate filler. TO BE UPDATED LATER Repair of damage: ‡ Sand out the damage and recreate the paint finish. Create the paint finish strictly in accordance with the general technical information. Adhesion defects in clear lacquer. Clear lacquer detched from base paint. Cause/damage pattern: ‡ Base paint layer too thick. ‡ Intermediate and final flash-off times of base paint too long. ‡ Incorrect mixture ratio clear lacquer/hardner. TO BE UPDATED LATER Repair of damage: ‡ Refinish sanding and recreate the paint finish. Sanding scores Single or wide area clusters of scoring or sanding marks, often with raised edges. Noticeable on metallic paints as light-dark stripes. Cause/damage pattern: ‡ Stopper sanded too coarsely. ‡ Filler sanded too coarsely. ‡ Filler not thoroughly dried bfore sanding. ‡ Old paint sanded too coarsely. ‡ Soft elastic substrates, e.g. TPA base, treated with thinners which was too aggressive and therefore etched. ‡ Top coat applied too thinly. TO BE UPDATED LATER Repair of damage: ‡ If the damage pattern is minimal, after the top coat has dried fine sand the paint surface and refurbish by polishing. ‡ If the damage is great or on metallic paints, sand the paint surface or substrates and if necessary remove them, then cover the bare metal and re-paint.