Water Spotting normally appears as light, whitish circular spots on the paint surface caused by the drying of a solution of water combined with mineral salts. The inner areas are normally intact, whilst the outer edge are often slightly raised.
Ensure all fresh paints are applied using correct hardener, correct mixing ratio and the number of coats (film thickness) is correct and not excessive.
If the damage is minor, first try washing with clean water; if this does not cure the problem polish with Glasurit Fine Polishing Paste 562-1602 and finish with any standard deep gloss polish. For severe damage, sand the surface, ensure it is thoroughly cured (see chapter "Solvent Test") and repaint.