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Galvanised steel is produced by dipping the steel work into a bath of molten zinc.
The steel is coated with minimum 85 microns zinc metal which provises excellent corrosion protection.
The galvanised steel need to be properly prepared and pre-treated before the coating system can be applied.
The galvanised steel has a waxy layer on the serface, which is part of the dipping process. Tthis must be removed by degreasing the surface witha solvent or detergent wash.
An application of a suitable pretreatment is then required. Suitable pre-treatment products are:
- T-wash: a mordant solution which turns black to indicate the tha pre-treatmnent process has worked and passivated the surface. We recommend that the surface is washed down with clean water to remove any excess T-wash prior to painting.
- 2-pack Etch primer: a two pack (base and catalyst which are miixed together) pre-treatment wash primer (dft 10 microns) which etches into the surface and forms the base for the paint system.
- 1-pack Etch primer: a single pack pre-treatment wash primer (dft 10-15 microns) which etches into the surface and forms the base for the paint system.
The use of non-saponifiable coatings are recommended for overcoating galvanised steel.
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