Conventional paints adhere poorly to hot-dip galvanized surfaces. A conversion coat is necessary to ensure good adhesion of the paint and long term protection of the steel.
On industrial production lines, hot phosphating or chromating by dipping or spraying in different stages, offers satisfactory results only when the total treatment- phosphating or chromating followed by an appropriated stoving paint- is carefully controlled.
A serious problem arises when such hot surface treatments cannot be applied as is the case for industrial maintenance and marine painting, structural steelwork, touch up work on coil coated surfaces and vehicle maintenance and repair work.
The usual polyvinyl butyral/phosphoric acid based wash primers and the modified short oil alkyd or epoxy ester primers do not normally ensure the expected adhesion improvement they offer on steel and other non ferrous metals.
The technical reasons for these failures are well known:
T-wash or mordant solution is unsuitable where partial weathering has occurred.
Sweep blasting can damage irreparably the galvanized layer on vulnerable edges and corners.
ACTAN®GS is a long-term adhesion primer for use on newly, partially or fully weathered galvanized steel, aluminium, copper, bronze and stainless steel.
It can be sprayed or brushed without further dilution and forms on drying a hard, flexible and non porous film which adheres perfectly to the surface.
ACTAN®GS is an environmentally friendly product for treating galvanized and non ferrous metals prior to the application of a wide range of protective paint systems.