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Primered areas should if possible be given a very light `guide coat' to ensure the surface is fully flatted, with any dry spray sanded smooth. Sand all panels to be sprayed using a flat sanding block with plenty of clean water. Take care not to leave gouges with the edge of the block, or by applying to much pressure while sanding. Light, even strokes are all that is needed for efficient sanding, once again avoiding circular motions which tend to show through the final coats. All areas that are to have paint applied must be sanded until the surface is matt when dried, otherwise paint adhesion will be poor. Particular attention should be given to panel edges and areas where trims or mouldings could not be removed, especially awkward places such as around door handles or wiper spindles.
If the existing paint in these areas is in good condition and only needs to be sanded to `key' the new paint, abrasive nylon pads, commonly 3M's Scotchbrite, are available in suitable grades from motor factors. As they are soft and flexible access to difficult corners is made much easier.
As each panel is sanded wash the residue away before it dries, as some paints and primers can leave a slurry that sets almost as hard as the original material. Rinse and then dry all the repaired panels with absorbent cloth without leaving water to dry naturally on the panels, to avoid problems with lime or contaminants in the water causing problems at a later stage.
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