Macropoxy L574 Red Oxide

Description

Technical Information

Macropoxy L574 (formerly known as metaguard L574) is a two-component, epoxy temporary protective primer.

Where To Use

Temporary protective for steel surfaces prepared by abrasive blast cleaning. Suitable for use in conjunction with cathodically protected steel. Suitable for welding and fabrication and for overcoating with most paints in common use except high content metallic zinc products (see note on fabrication overleaf). As a sealer for aluminium and zinc metal spray. As a primer for use over stainless steel and non-ferrous metallic substrates.

Advantages

• Chemical resistant
• Water resistance properties

Application

Airless Spray
Nozzle Size : 0.38mm (15 thou)
Fan Angle : 80
Operating Pressure : 155kg/cm (2200 psi)
The airless spray details given above are intended as a guideonly. Details such as fluid hose length and diameter, painttemperature and job shape and size all have an effect on thespray tip and operating pressure chosen. However, the operatingpressure should be the lowest possible consistent withsatisfactory atomisation. As conditions will vary from job to job, itis the applicators responsibility to ensure that the equipment in
use has been set up to give the best results. If in doubtSherwin-Williams should be consulted.

Conventional Spray
Nozzle Size : 1.27mm (50 thou)
Atomising Pressure : 3.5kg/cm (50 psi)
Fluid Pressure : 1.0kg/cm (15 psi)
The details of atomizing pressure, fluid pressure and nozzle size are given as a guide. It may be found that slight variations of pressure will provide optimum atomisation in some circumstances according to the set up in use. Atomising air pressure depends on the air cap in use and the fluid pressure depends on the length of line and direction of feed i.e. horizontal or vertical.

Brush
The material is suitable for brush application to small areas andfor touch up purposes.

Roller
The material is suitable for roller application.

Preparation and Build-Up:
Metagard L574 is not intended to replace a coat of primer in the main paint specification, it is designed to provide temporary protection, until the specified paint scheme can be applied. However in practice, the use of Macropoxy L574 does make a substantial contribution to the performance of the complete paint specification in terms of ultimate durability and resistance to corrosion.The applied dry film thickness of prefabrication primers is normally below 30 microns. At this level of dry film thickness, factors such as blast profile, unevenness of application andseverity of exposure conditions may signifi cantly affect theperformance.

Epoxy paints should preferably be applied at temperaturesin excess of 10C. In conditions of high relative humidity, i.e.80-85% good ventilation conditions are essential. Substratetemperature shall be at least 3C above the dew point andalways above 0C.

At application temperatures below 10C, drying and curingtimes will be signifi cantly extended, and spraying characteristics may be impaired. Application at ambient airtemperatures below 5C is not recommended.In order to achieve optimum water and chemical resistance,temperature needs to be maintained above 10C duringcuring.
If it is desired to overcoat outside the times stated on the datasheet, please seek advice of Sherwin-Williams.