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Blast and Holding Primers
Blast and holding primers provide essential protection for steel surfaces between abrasive blast cleaning and metal topcoats. They are designed to prevent corrosion during fabrication and weathering, allowing for welding and further treatment without compromising surface integrity. Epoxy-based options like Sherwin-Williams Macropoxy G280 and L574 offer welding and fabrication suitability, while International Intergard 276 and Hempel Hempadur 15590 are ideal for immersion applications. Zinc phosphate primers, such as PPG Sigma EP 110, deliver excellent rust prevention in industrial and coastal environments, offering long-term protection.
Sherwin-Williams Macropoxy L574
Sherwin-Williams Macropoxy L574 (formerly known as Metagard L574) is a two-pack temporary protective primer for steel surfaces prepared by abrasive blast cleaning.
Sherwin-Williams Macropoxy G280
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. Two pack epoxy Temporary protective for...
Hempel Hempadur 15590
Hempadur 15590 is a two-component epoxy primer coating especially for use on surfaces exposed to severe abrasion. For professional use only Blast primer for heavy duty epoxy systems on submerged and non-submerged areas according to specification Air or airless spray application, for new builds, maintenence and repair More Information...
Jotun Penguard Tie Coat 100
Jotun Penguard Tie Coat 100 is a two component polyamide cured high molecular weight epoxy coating specially designed as a tie coat/sealer on top of inorganic zinc silicate primers, galvanised steel and thermally sprayed zinc. To be used as a primer in a complete system in atmospheric environments. Recommended for offshore environments,...
International Intergard 276
International Intergard 276 is a quick drying two component epoxy primer suitable for overcoating after prolonged periods of weathering, for use at both new construction and maintenance.
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Blast and Holding Primers for Steel Fabrication and Corrosion Prevention
Blast and holding primers are essential for protecting freshly blasted steel surfaces during the interval between surface preparation and final coating. These temporary coatings prevent flash rust and corrosion, helping to maintain surface integrity and reduce costly rework—particularly on large-scale or phased projects. In fabrication environments, weldable metal primers such as Sherwin-Williams Macropoxy G280 and Macropoxy L574 provide reliable protection while allowing for cutting, welding, and forming without compromising bond strength. These products are ideal for prefabricated steel components and structural assemblies awaiting final metal primers.
For steel exposed to coastal, industrial, or marine environments, epoxy blast primers like International Intergard 276 and Hempel Hempadur 15590 deliver dependable performance. Intergard 276 can be overcoated after extended weathering, while Hempadur 15590 is suited to both submerged and dry conditions, making it a trusted option in marine paints systems. Zinc phosphate primers such as PPG Sigma EP 110 offer high corrosion resistance and are approved by Network Rail and the Highway Agency, making them ideal for infrastructure exposed to moisture, salt, or high pollution levels.
Blast and Holding Primer FAQs
Can blast primers be used on non-ferrous metals like aluminium or galvanised steel?
No. These primers are developed for carbon or mild steel. Non-ferrous metals require different surface preparation and specialist primers for proper adhesion.
What happens if the primer film is damaged during fabrication?
Damaged areas must be cleaned and touched up with the same or compatible metal primer to maintain corrosion resistance. Unprotected spots can rust quickly, especially in humid or coastal locations.
Are these primers safe to use in confined spaces?
Many contain solvents that release vapours during application. Ventilation, air-fed respirators, and safety monitoring are essential when working in enclosed or poorly ventilated areas.
Can blast primers be used as part of fire protection systems?
No. Blast and holding primers are not intumescent or fire-retardant. If fire protection is needed, use certified intumescent primers and coatings tested to meet relevant fire standards.
Can these primers be applied in cold weather?
Yes, but surface and air temperature limits apply. Some systems require a minimum temperature of 5°C and a dew point margin to avoid condensation.
Do primers resist chemical spills or industrial solvents?
Standard holding primers offer limited resistance. For chemical protection, apply a suitable topcoat or select a system specifically designed for chemical exposure.
Is overcoating with water-based paints possible?
In most cases, no. Solvent-based topcoats are preferred. If a water-based system is required, technical guidance should be followed closely to avoid adhesion issues.
Can blast primers be applied by brush or roller?
Most are designed for spray application to ensure consistent film build. Some allow touch-up by brush in small or complex areas.