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Epoxy Primer - Fortis 823 Prime

A fast cure solvent-based epoxy primer for concrete substrates before application of topcoats including flake floor. Available in Clear and Light Grey


FORTIS 823 PRIME is a solvent-based two-component epoxy primer providing excellent adhesion to porous substrates. The low viscosity ensures deep penetration and superior coverage whilst allowing for quick reapplication of topcoats.  This product exhibits both organic and inorganic reactivity, allowing the epoxy to chemically react with inorganic substrates, giving enhanced adhesion characteristics.  Fortis 823 Prime is available in both Clear and Light Grey.


2 Component Epoxy


• Excellent substrate wetting
• Superior Coverage
• Fast film cure time
• Chemically bonds to siliceous material
• Good low-temperature cure
• Blush resistant


Construction, Automotive & Marine, Concrete, Industrial & Mining


Fortis 823 PRIME can be applied is best applied by roller. It can be also be applied by airless spray systems as long as all safety precautions have been taken. Mixed material should be poured out in ribbons across the area to be rolled. A microfibre 5-8mm NAP roller cover is recommended. For porous substrates, multiple wet on wet applications may be necessary.


Ensure Fortis 823 PRIME Part A and B are shaken before pouring and mixing. The mixing ratio for Fortis 823 PRIME is 1 Part Resin (Part A) to 1 Part Hardener (Part B) by volume; graduated plastic mixing containers are recommended for measuring volumetric quantities. Part B is to be added to Part A and mixed at low speed with a Jiffy style mechanical mixer. Mix only enough material for immediate use. Mix until a smooth and homogeneous mixture is formed, free of striations. This should take approximately 1 minute. Ensure material from the bottom and edges of the pail are sufficiently mixed. Let material stand for 1 minute. Mix for an additional minute.


Concrete: Substrates should be clean and free of loose material, old coatings, curing membranes, oils, and grease. If applying over existing coatings adhesion should be tested by preparation of a small test area. Remove all potential contaminants. On new concrete surfaces, it is best to diamond grind the surface. Old surfaces are best diamond ground but it is possible to etch and clean the surface. Contact Fortis if unsure. New concrete must be cured for a minimum of 28 days before the application.


Pack Sizes

Clear - 8L and 40 Light Grey - 20L

Available Colours

N35 Light Grey


Technical Datasheets

Fortis 823 Prime Technical Data Sheet
Fortis 823 Prime Light Grey Technical Data Sheet

Safety Datasheets

Fortis 823 Prime Part A Safety Data Sheet
Fortis 823 Prime Part B Safety Data Sheet
Fortis 823 Prime Light Grey Part A SDS
Fortis 823 Prime Light Grey Part B SDS


Refer to Resources