The topcoat for roofers who don’t do half jobs.

RORR Grey Topcoat is a Pure GRP finishing layer — not a reblend, not a “mystery mix.” It rolls out smooth, cures clean, and leaves a hard, weather-resistant finish that looks sharp and lasts. Pair it with RORR Roofing Resin and RORR CSM for a system that behaves predictably from first coat to final gloss.

Why roofers pick this topcoat

• Pure GRP, zero reblend — consistent colour, cure and texture job after job.
• Smooth roll-out — medium viscosity for easy application and a tidy, pinhole-resistant finish.
• Winter-optimised reactivity — keeps cure times practical as the temperature drops.
• Thixotropic control — stays put on edges and trims instead of running.

Nerd note: Lab data on the base system shows a 12–18 min gel at 25 °C using MEKP (reference charge ~1.25%), with peak exotherm in the 85–125 °C window — a sensible working time for roofing.

Finish & coverage

• Colour: Grey (site-friendly, hides scuffs).
• Finish: Dense, weather-resistant film with strong edge hold when applied correctly.
• Typical coverage: Plan ~0.4–0.6 kg/m² depending on texture and exposure (laminate tightness, temperature, roller profile).
• System fit: Over RORR laminate (resin + CSM) and RORR Bandage on details; completes the RORR roof build.

How to use (at a glance)

1. Prep: Laminate must be fully cured, abraded where glossy, and clean/dry.
2. Stir & catalyse: Mix thoroughly, then add Catalyst per your dosing chart (reference conditions above are ~1.25% at 25 °C).
3. Apply: Roll/brush at planned coverage. Work methodically to avoid laps and pinholes.
4. Cure: Allow full cure before trafficking or rain exposure; cure accelerates with warmth and airflow.
5. Edge discipline: Load the roller on edges and trims; thixotropy helps it stay where you put it.

Safe, sensible handling (no cowboy stuff)

• Flammable (Cat. 3), flash point ~33 °C. Keep away from ignition; ventilate well.
• Contains styrene. Follow UK WELs; use appropriate gloves/eye protection/respiratory if needed.
• Transport ID: UN 1866 — RESIN SOLUTION (ADR/RID/IMDG/IATA).
• Storage: Sealed, dark, 5–30 °C; protect from heat/sunlight.

Quick specs (for the no-nonsense crowd)

• Type: Pigmented GRP finishing topcoat (hand application)
• Base system viscosity (ref.): ~500–700 mPa·s @ 25 °C
• Density (ref.): ~1.10 g/cm³
• Gel window (ref., 25 °C): ~12–18 min with RORR Catalyst; winter-optimised reactivity.
• Pack size: 20 kg
• Colour: Grey

FAQs

Is this recycled or blended?
No. RORR is a Pure GRP system — consistent cure and colour from tin to tin.

Will it run on trims?
The formulation has thixotropic control — it stays where you put it when applied correctly.

Cold mornings — will it still kick?
The reactivity is optimised for winter, but always adjust MEKP to conditions and test a small area first.