Please always strictly adhere to the appropriate specifications provided by the topcoat manufacturers in conjunction with the correct ZingaMetall specification relating to the individual application.
Although Zinga can be easily over-coated with a wide range of topcoats, it should be noted when using epoxies etc. that Zinga is sensitive to solvents and all the necessary precautions should be taken to minimise its exposure to any solvents contained in the topcoats. ZingaMetall regard the use of the “mist-coat/full-coat” technique as vital to prevent this happening. An MIO or equivalent epoxy sealer should first be applied in a very fine mist coat (no greater than 20-30µm) which when cured, seals the Zinga and provides a barrier to the solvent in the subsequent coat. The second full-coat of the tie-coat can be applied at the same d.f.t. as before but tight control is required to ensure the maximum combined d.f.t. of 90µm is never exceeded. Please observe the relevant manufacturers drying and curing times for the tie-coat before proceeding on to the top-coats. This is vital to ensure that all the solvent has evaporated and minimises the potential for solvent entrapment.
Some paint companies sell epoxies which are specifically designed for use as tie-coats. The resins that are used in these tie-coats are “thin” resins; hence they do not require the addition of solvent prior to spray application. Normal epoxies which do require solvent to be added before application must not be used as they increase the potential for solvent entrapment. Avoid this problem by always using a proper tie-coat.
Paint manufacturers normally specify individual primer/top-coat systems and these should always be adhered to and applied over the tie-coat.
Topcoats to avoid using in conjunction with Zinga include all alkyd-based enamels, which must never be applied over any zinc based coatings. It should also be noted that cellulose lacquers cannot be applied directly onto Zinga and an automotive MS primer must be used beforehand. High-build vinyls and chlorinated-rubber paints are extremely high in solvent content so the advice of the previous paragraphs is particularly relevant. ZingaMetall recommend, where possible, the use of water-based topcoats to complement the environmentally friendly properties of Zinga.
Alufer N (another Zingametall product – see Product Range) is widely used to seal the Zinga prior to the application of topcoats.
Zinga is a truly unique coating product so if you have any query relating to compatible topcoats please contact the ZingaMetall.