Urethane clearcoats provide a degree of protection for the finish
that many single stage paint systems do not. As a result it may be possible to correct
a number of minor paint defects without refinishing the affected panel. Examples of
the types of defects which can be repaired in this manner are shown in the illustration.
It must be noted, however, that in cases where a significant amount of clearcoat
has been removed it may be worthwhile to spray an additional coat to ensure long-term
durability of the finish. In either case little time is wasted in the process since
it is a good practice to clean the repair area with a compound prior to a spot repair.
- Thoroughly wash the repair area with a mild detergent and water solution.
- Apply a small amount of fine machine-rubbing compound to repair area and
spread evenly with a compound pad.
- With the polisher running at approximately 2700 rpm, add compound
to the repair area. Keep the pad flat against the panel while applying light pressure.
Feature lines and panel edges should be hand-rubbed to avoid burn-through. Check the
repair area frequently and, if necessary, add more compound.
- If sanding is required, proceed to step 6. If no sanding is required,
apply polish to the repair area and evenly spread with a polishing pad.
- Keep the pad flat to the panel and allow the weight of polisher to do
the work. Use polish sparingly to achieve original shine. Machine or hand polish the
repair area first, then blend in with the rest of the panel.
- Attach a piece of micro-fine sandpaper to a sanding pad. The addition of a small
amount of liquid detergent to the water will improve wet-out and sanding performance.
- Keep repair area wet while sanding. Sand lightly and evenly in 1 direction
only, using straight strokes.
- Using a clean cloth, wipe the repair area clean of water and clearcoat residue.
- Add compound and polish, as necessary. Often, hand compounding and polishing
of a small repair area is all that is necessary to restore the appearance.