Sherwin-Williams Macropoxy G280 (formerly known as Metagard G280) is a two pack epoxy zinc free prefabrication primer. It is a temporary protective for steel surfaces prepared by abrasive blast cleaning. Suitable for welding, cutting and forming when applied at the recommended dry film thickness.
Sherwin-Williams Macropoxy G280 (formerly known as Metagard G280) is a two pack epoxy zinc free prefabrication primer. It is a temporary protective for steel surfaces prepared by abrasive blast cleaning. Suitable for welding, cutting and forming when applied at the recommended dry film thickness.
Macropoxy g280 can be overcoated with a wide variety of materials, the choice of system being dependent on exposure conditions.
The material should preferably be applied at temperatures in excess of 10oC. In conditions of high relative humidity, ie 80-85% good ventilation conditions are essential. Substrate temperature shall be at least 3oC above the dew point and always above 0°C.
At application temperatures below 10°C, drying and curing times will be significantly extended, and spraying characteristics may be impaired.
Application at ambient air temperatures below 5°C is not recommended.
In order to achieve optimum water and chemical resistance, temperature needs to be maintained above 10oC during curing.
This material should be overcoated before any breakdown, such as peak rusting occurs. If such breakdown occurs as a result of extended exposure, re-preparation of the substrate by flash blasting or mechanical methods will be necessary.
Drying times, curing times and pot life should be considered as a guide only.
The curing reaction of epoxies commences immediately the two components are mixed, and since the reaction is dependent on temperature, the curing time and pot life will be approximately halved by a 10°C increase in temperature and doubled by a 10°C decrease in temperature.
Preparation and Build-Up: This material 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 this material does make a substantial contribution to the performance of the complete paint specification in terms of ultimate durability and resistance to corrosion.
Where this material has been subject to exposure prior to overcoating, thorough cleaning down will be required to ensure that all traces on contamination (e.g. dust, oil, grease, salts, etc.) are removed before application of the full paint system.
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 and severity of exposure conditions may significantly affect the performance, especially immersion or water pooling.
Fabrication: While this material is classed and approved as a welding primer, under certain types of welding operations e.g. high speed twin-fillet welding, fabricators are advised to satisfy themselves that the product is suitable for their particular welding process.
Stability: Highly pigmented, low solids materials are prone to settling in the can. This will in no way affect the product performance provided the material is thoroughly stirred prior to use.
Numerical values quoted for physical data may vary slightly from batch to batch.
Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.
Sherwin-Williams Macropoxy G280 is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.
Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.
Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.
All delivery costs below are excluding VAT
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