Sherwin-Williams Macropoxy C402V2 is a high build 2-pack epoxy zinc phosphate primer/buildcoat, which provides anti-corrosive protection of carbon steel surfaces prepared by abrasive blast cleaning.

May be brush applied onto hand or mechanically prepared surfaces and/or damp gingered surfaces, giving excellent wetting and adhesion characteristics.

Can be applied at thicknesses between 75 and 250 microns dry to provide both primer and buildcoat in a single coat. A top coat is only required for decorative purposes.

Without topcoat, the material will quickly discolour, and patchiness may be exaggerated due to film thickness variation but will nonetheless provide excellent anti-corrosive protection as a single coat protective epoxy nor will intercoat adhesion be affected by any discolouration. See reverse side for further information on colour stability.

For use in internal/external exposed conditions, including offshore, petrochemical, but not for fully immersed applications.

Quick Links - Click To Jump To Section:

• Features & Benefits
• Product Specification
• Drying Times
• Thickness Rates
• Application Rates
• Recommended Topcoats
• Surface Preparation
• Application
• Additional Notes
• Case Studies
• Health and Safety

Features & Benefits

• Network Rail endorsed
• Touch dry in up to 90 minutes at 23°C
• For use in internal/external exposed conditions, including offshore and petrochemical
• Can be applied at thicknesses between 75 and 250 microns

Product Specification

Drying Times

• These figures are given as a guide only
• Factors such as air movement and humidity must also be considered

Thickness Rates

• * This figure makes no allowance for surface profile, uneven application, overspray or losses in containers and equipment
• Film thickness will vary depending on actual use and specification

Application Rates

• * Maximum sag tolerance with overlap typically 533μm wet (400μm dry) by airless spray and 187μm wet (140μm dry) by brush

Recommended Topcoats

• For overcoating with epoxy products (including self-overcoating), the maximum recommended interval is 28 days at 23°C. For overcoating outside this interval, consult Rawlins technical team on Tech - 0113 2455450 (option 2) or [email protected] for advice
• Where a high degree of gloss and colour retention is required, overcoat with Acrolon C137V2, Acrolon C237, Acrolon 1850 and Acrolon 7300 within 7 days at a minimum dft of 50 microns or in the case of Acrolon C750V2 overcoat within 4 days. These overcoating times refer to achievement of optimum adhesion at 23°C and will vary with temperature
• For overcoating outside the above parameters and with alkyd systems, consult Rawlins technical team on Tech - 0113 2455450 (option 2) or [email protected] for further advice

Surface Preparation

• Blast clean to Sa2½ (ISO 8501-1:2007). Average surface profi le in the range 50-75 microns
• Manually prepared surfaces should be prepared to a minimum standard of St3 ISO 8501-1:2007 at the time of coating
• Application to such surfaces should be by brush or roller where the mechanical action will aid adhesion
• Ensure surfaces to be coated are clean, dry, and free from all surface contamination

Application

• Epoxy paints should preferably be applied at temperatures in excess of 10°C. Relative humidity should not exceed 90% and in these conditions good ventilation is 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. To achieve optimum water and chemical resistance, temperature needs to be maintained above 10°C during curing
• If it is desired to overcoat outside the times stated on the data sheet, please seek advice of Rawlins Technical Team on Tech - 0113 2455450 (option 2) or [email protected]

• The airless spray details given above are intended as a guide only
• Details such as fluid hose length and diameter, paint temperature and job shape and size all have an effect on the spray tip and operating pressure chosen. However, the operating pressure should be the lowest possible consistent with satisfactory atomisation
• As conditions will vary from job to job, it is the applicators’ responsibility to ensure that the equipment in use has been set up to give the best results. If in doubt Rawlins Technical Team should be consulted on Tech - 0113 2455450 (option 2) or [email protected]

• The details of atomising 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
• For application by conventional spray, it may be necessary to thin the paint by the addition of up to 10% Cleanser Thinner No. 5. Where thinning has been carried out the wet film thickness must be adjusted accordingly
• N.B. Thinning will affect VOC compliance. Brush and Roller: The material is suitable for brush and roller application. Application of more than one coat may be necessary to give equivalent dry film thickness to a single spray applied coat

Additional Notes

• 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
• It is possible to apply Macropoxy C402V2 onto a damp substrate (no running water or pooled water) by brush application. Ensure that the paint fully displaces any water on the surface

Epoxy Coatings - Colour Stability

• Variable colour stability is a feature of epoxy materials which tend to yellow and darken with age particularly when used on internal areas. Therefore, any areas touched-up and repaired with the same colour at a later date may be obvious due to this colour change
• When epoxy materials are exposed to ultra-violet light a surface chalking effect will develop. This phenomenon results in loss of gloss and a fine powder coating at the surface which may give rise to colour variation depending on the aspect of the steelwork. This effect in no way detracts from the performance of the system

Epoxy Coatings - Tropical Use

• Epoxy paints at the time of mixing should not exceed a temperature of 35°C. At this temperature, the pot life will be approximately halved. Use of these products outside of the pot life may result in inferior adhesion properties even if the materials appear fit for application. Thinning the mixed product will not alleviate this problem
• The maximum air and substrate temperature for application is 50°C providing conditions allow satisfactory application and fi lm formation. If the air and substrate temperatures exceed 50°C and epoxy coatings are applied under these conditions, paint film defects such as dry spray, bubbling and pinholing etc. can occur within the coating
• Numerical values quoted for physical data may vary slightly from batch to batch

Case Studies

Edinburgh Waverly Railway Station

Edinburgh Waverley railway station is the main station in the Scottish capital. Covering an area of more than 101,000 m² (25 acres) in the centre of the city, it is the second-largest main line railway station in the United Kingdom in terms of area, and is both a terminal station and a through station, in contrast to most of the major London stations.

The major challenge was to prepare and repaint all the iron work without inconveniencing passengers and disrupting the day to day running of this busy railway station. Not all areas could be abrasive blast-cleaned, so the contractor required a protective system that was suitable for blast-cleaned and mechanically prepared iron work.

Health and Safety

• Please read the product data sheet and safety data sheets for this product in the attachments section above