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Surface Preparation. Surfaces must be clean and degreased.
Pre-painted or stainless steel surfaces should be mechanically keyed by
rubbing with emery cloth. Freshly galvanised metal must be treated
with a Mordant solution. For aluminium, use an etching primer.
Other unpainted metal surfaces should be treated with a single coat of a
quality matt primer.
Application. The maximum wet thickness of compound which can be
applied to vertical surfaces is approx. 3mm (4.5kg/m2 wet
weight). Greater thicknesses can be built up by successive coats but
complete drying of each coat between applications is essential. If the
product is to be trowelled onto other than horizontal surfaces, a keying
coat of diluted compound should initially be brush applied and allowed to
thoroughly dry before applying the main body of compound. Whichever
application method is used, all drums of compound must be thoroughly stirred
before use with a low speed electric stirrer.
Spraying Equipment. The material can be pumped using either a
Pressure Pot or 4:1 ratio pump (with sand kit). Both require a minimum
compressed air supply of 20cfm at 650psi. The material delivery hose
must have a minimum internal diameter of 0.75" (18mm). The spray gun
should be of the air-mixture type with 0.25" (6mm) internal diameter nozzle.
The maximum application rate with the above equipment will be approx. 3kg
per minute.
Drying. Drying times depend on the compound thickness and ambient
conditions. Examples of typical drying times are shown below. |
