EverFlor - Prime 4H - Rapid Cure Epoxy Floor Primer

EverFlor Prime 4H is a rapid cure epoxy floor primer for porous and absorbent concrete. It is the fast-curing member of the EverFlor deep-penetrating primer family. It does the same job as Prime DP: it seals and stabilises the slab before coating. The difference is time. At 20°C you can overcoat after 4 hours, so priming and topcoating fit into one working day.

The primer is a two-pack epoxy. Once mixed, the resin wicks into the open pores of the concrete and cures there. It locks the surface together and closes the pores. The floor coating then sits on a sealed, uniform base instead of being drawn into the slab.

Prime 4H goes under compatible EverFlor floor coating systems. It is a primer, not a wearing surface. Apply one coat, then follow with the specified topcoat within the overcoat window.

Recommended areas of use

• Porous concrete floors in warehouses, workshops and factories
• Garage floors
• Commercial and industrial floors before coating
• Absorbent concrete that needs stabilising before a floor coating
• Refurbishment projects where coating downtime must be kept short
• Interior and exterior concrete

Features

• Rapid cure: the floor accepts foot traffic and the next coat on the same day at 20°C, cutting downtime on time-critical jobs.
• Deep penetrating: the resin enters the pores of absorbent concrete and cures within them, stabilising the surface.
• Seals before coating: closed pores stop the topcoat soaking in unevenly, so it builds and cures as a consistent film.
• Solids-only formulation: nothing evaporates from the film, so the material you apply is the material that stays on the floor.
• Low VOC: under 30 g/l, so odour and emissions during application are kept low.
• Single-coat primer: one coat prepares the floor on most porous concrete.
• Grey colour: the primed area is easy to see, so missed patches show up before topcoating.
• Interior and exterior use within the application temperature range.

Good to know

• Preparation decides adhesion. Remove laitance, dust, grease and curing compounds, and mechanically key smooth or power-floated concrete.
• Very porous areas absorb more primer than dense concrete. Allow extra material so these areas end up sealed.
• Mixed material has a short working life. Mix only what you can apply straight away.
• Cure speed depends on temperature. Cold substrates and air slow the cure; the stated times apply at 20°C.
• Overcoat within the maximum overcoat window. Contact us before coating a primer that has passed it.
• Prime 4H is not presented as a primer for oil-contaminated or damp concrete. Use Prime OT for previously oil-contaminated concrete and Prime DT for damp substrates. Where downtime is not a constraint, Prime DP serves the same role as Prime 4H.

SURFACE PREPARATION

Prepare the floor correctly. Adhesion depends on it. The concrete must be clean, dry and sound.

Remove all dust, dirt, grease, laitance and curing compounds. Mechanically prepare smooth or power-floated concrete to open the surface and give a key. Vacuum the floor after preparation.

Apply between 5°C and 25°C.

MIXING

The mixing ratio is 2.7 : 1 by weight, Part A to Part B. Mix the full unit. If you split a unit, weigh both parts accurately.

Stir Part A first. Add all of Part B. Mix with a slow-speed mixer until fully uniform. Do not add thinners.

Pot life is 30 minutes at 20°C. Mix only what you can apply in that time. Warmer conditions shorten it.

APPLICATION

Cut in edges and corners with a brush. Roll the open floor with a medium pile roller. Work the primer well into the concrete.

Apply one coat. Porous areas absorb more material. Go back over them until the surface looks sealed, not dry and patchy.

DRYING AND OVERCOATING

At 20°C the primer is touch dry in 2 hours. It takes foot traffic and can be overcoated after 4 hours.

Apply the topcoat within 48 hours at 20°C. Full cure takes 2 days. Lower temperatures extend every one of these times.