Defeitos e danos na pintura

501-36-25 Paint - General Information 501-36-25 DESCRIPTION AND OPERATION Cause/damage pattern: ‡ Cold with low air humidity. ‡ Heat with high air humidity. ‡ Substrate can be etched. ‡ Hardener fault or wrong hardener used. ‡ Paint thinned too much. ‡ Proportion of pigment too high because of poor stirring. ‡ Not optimum drying. TO BE UPDATED LATER Repair of damage: ‡ After drying, remove the matt effect by polishing. If unsuccessful, rub down complete area and paint again. Covering ability/areas of thin paint Different color shades in the surface. The minimum layer thickness is not achieved here. The effects range from local minor shade variations through mottled spray zones to completely missing top coat. Cause/damage pattern: ‡ No correct, uniform substrate (effect paint). ‡ On three-layer systems, wrong filler. ‡ Insufficient top coat application. TO BE UPDATED LATER Repair of damage: ‡ Sand surface and recreate the paint finish. Flow problems/orange peel Surface structure bumpy, grained. The surface is similar to the peel of an orange. Cause/damage pattern: ‡ Paint viscosity too high. ‡ Use of fast evaporating, highly volatile thinners. ‡ Booth temperature too high. ‡ Spray gun distance too great, too little material applied. ‡ Nozzle too large. ‡ Incorrect spray pressure. TO BE UPDATED LATER Repair of damage: ‡ Small surfaces: fine sand and polish. ‡ Sand out the surface and recreate the paint finish. Dirt embedded in metallic base paint. Inclusions of contamination in metallic base paint, of different sizes and shapes (grains or lint). Cause/damage pattern: ‡ Dust was not properly removed from the surface to be painted. ‡ Paint material not sieved. ‡ Function of the painting facilities not optimum. ‡ Filter contaminated. ‡ Wearing unsuitable clothing. Repair of damage: ‡ Sand and repaint.