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501-36-64 Paint - General Information 501-36-64 DESCRIPTION AND OPERATION Tips and Tricks Comparing paint structures It may happen that an area remains visible, especially when the area of the repair is small. The reason for this is the structural variation in the paint surface at the repair location compared with the original paint finish. The original paint finish has a slight orange peel effect while the repair areas is extremely smooth. This effect can be reduced by fine sanding using P3000 of the area around the repair location and then polishing. Etching substrate If the substrate can be etched during the solvent test, suitable preparation must be done. Job steps: NOTE: Follow the manufacturer specific instructions. ‡ Sand the damaged area extensively using an eccentric sander and P80 or P120 abrasive sheets. Finish off sanding with P150 or P180. ‡ Remove the sanding dust and clean the area of the damage using silicone remover. ‡ Apply polyester stopper to the bare panel and to the damaged area. ‡ Sand the dried polyester stopper to an even surface using P80 - P150. Finish sanding using P180 - P240. If required apply more stopper, again only on the bare panel. ‡ Wet sand the residual old paint finish using P600 - P800. Transitions with P400 - P600. Clean with silicone remover. ‡ Prime bare metal areas with acid primer. ‡ After the acid primer has been left exposed to the air for the correct evaporation time, apply 2-component primer filler in thin layers over the complete repair area, leaving enough air exposure time in between coats. ‡ After the filler has dried, sand wet with P800 or sand dry with P400. Sanded through areas must be covered again with 2-component Nonstop filler primer. Another possible method of preventing etching of the substrate is to use waterbased primer and filler materials. Masking the vehicle Masking and covering work are among the most important preparations required to achieve a high quality paint finish. Paint application onto neighboring components, paint mist and sharp paint transitions are quality faults. For this reason it is extremely important to take special care and to use suitable masking materials. NOTE: When water based paints are used, all materials must be stable towards water. Plan the masking work: ‡ Determine the sequence of masking work. Sometimes after masking film has been applied, it is difficult or impossible to reach certain areas. ‡ Prepare the masking material. ‡ Start with small difficult areas. Pay special attention to the areas of profiled seals, edges, openings and paint transitions. Masking tape Masking tape is available in various widths for special application areas. In practice however, a wide tape has proved best for almost all areas, also taking into account the time required for masking work. NOTE: Use of differing masking materials is often much more time-consuming. Advantages ‡ Good coverage. Narrower tapes must often be applied in several layers. ‡ More resistant to tearing. ‡ Wide tapes can be applied deep into joints and therefore protect from paint mist and contamination. ‡ Removal is often easier. Masking film Transparent plastic film has become accepted as a practical method to mask large areas of a whole vehicle. It can quickly and easily be applied to the vehicle from the roll.