Never apply alkyd paints
on ZINGA. The alkyd will react with the Zinc and make it saponify.
Water based products can cause formation of Zinc salts underneath the topcoat, resulting in bad adhesion. Water based coatings should not be used on top of ZINGA.
In general, fast drying paints perform a lot better on ZINGA. Fast drying paints allow less time for the solvent of the topcoat to penetrate the ZINGA layer and consequently damage its cathodic capacities. Ideally, the paint should not have a touch dry time (20°C) of more than 1 hour, with 2-3 hours maximum.
If the topcoat forms acid products upon curing, this can affect the ZINGA coating. Information on the product formation upon curing can be found in MSDS sheets.
If a paint is fully cured, it can no longer affect the ZINGA layer. If this cure time is short, the impact on ZINGA is also reduced, insuring better compatibility.
ZINGA is sensitive to sulphates. Therefore topcoats containing sulphates should be avoided.