Aquazinga

It cannot be stressed strongly enough that the key to AquaZinga's long life is in the thorough preparation of the steel substrate to the correct specification. Please always follow the appropriate Zinga UK specification in conjunction with the relevant Technical Data Sheets. (TDS)

The following information will give a general guide to the coating and its application.

New steel

- Steam-clean or high-pressure wash-down all surfaces
- Allow to totally dry
- Blast-clean to a cleanliness standard of Sa 2.5

Old steel

The preparation and application technique is identical to that for new steel, but where old marine steelwork is being prepared the water-jetting must use water dosed with Chlor*Rid, Salt Away or similar low ph chloride remover. This is because the chloride ions are inside the surface of the steel and need to be removed both chemically and under pressure.

Notes:

a) The steel temperature must always be above 10 degrees C

b) The relative-humidity must be below 70% (or it can start curing at the steel/zinc interface)

c) The relative humidity must be above 40% (or the surface must be sprayed with a water-mist after drying for 10-15 minutes)

Note 1: The term "high pressure" means a minimum water-pressure of 10,000psi. Any pressures below this level will not totally remove engrained chlorides.

Note 2: The grit used on all structural steelwork must comply with 50µm and 80µm depending on the type of application). The chosen grit should always be able to achieve a blast roughness of 12.5 to 15 microns. It should be noted that UHP Blasting does not create a profile and should therefore never be used as the sole means of surface preparation. UHPAB is an excellent form of blast-cleaning for marine structures as it removes all crustacean growth, scale, engrained chlorides and invisible contaminants.

Note 3: UHP Blasting must never be used with Aquazinga applications, unless it forms the initial stage of preparation followed by grit-blasting.

Note 4: UHPAB (ultra-high pressure abrasive blast) is an excellent form of blast-cleaning for marine structures, as it removes all crustacean growth, scale, engrained chlorides and invisible contaminants.
When using this system, it is very important that the surface-water on the steelwork must be allowed to dry completely before beginning the application of Aquazinga.

UNIQUE SYSTEM APPLICATION

When used as a stand-alone system, AquaZinga should be applied in two layers to obtain a maximum thickness (DFT) of 80 µm.

DUPLEX SYSTEM APPLICATION

In the case of duplex system application, a single layer of 50 to 80 µm of AquaZinga should be used. Prior to the application of a topcoat, the surface coated with AquaZinga should be free from zinc salts and other contaminates. A wide range of compatible sealers and topcoats can be applied to AquaZinga.

STRIPE COATING APPLICATION

Before the application of the first full layer of AquaZinga, it is recommended that a stripe coat of AquaZinga is applied to all sharp edges, nuts, bolts and weld areas using a brush.