Thermoguard Fire Varnish 2k Basecoat
£155.40 (inc. VAT)
£129.50 (ex. VAT)
- UK manufactured, trusted brands
Thermoguard Fire Varnish Basecoat is a professional-grade, 2-pack water-based intumescent varnish designed to protect timber and wood-based surfaces from fire. When used with Thermoguard Fire Varnish Overcoat, it forms a clear or stained finish that complies with BS EN Class B s2 d0, as well as British Standards Class 1 and Class 0 for surface spread of flame.
Ideal for preserving the natural appearance of internal or external wood, the system expands in fire conditions to create a heat-resistant barrier, preventing ignition and reducing smoke and gas emissions.
✅ Use on bare or previously varnished wood
✅ Available for interior and exterior applications
✅ Part of a certified fire-rated coating system
✅ 2-pack (base + activator) - mix before us
Surface Preparation
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Ensure timber is clean, dry and free of oils, wax or contamination
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Max moisture content: 18%
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Abrade non-porous, sealed or varnished surfaces with medium-grade silicon carbide abrasive
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Fill gaps with intumescent mastic to prevent fire ingress
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For tanalised or preservative-treated wood, consult Technical Department
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For OSB or specialist substrates, seek guidance before use
Tech Data
| Property | Detail |
|---|---|
| Fire Rating | BS EN Class B s2 d0, BS Class 1 & Class 0 |
| Use With | Fire Varnish Overcoat (Int/Ext) |
| Application | Interior & Exterior (with correct topcoat) |
| Finish | Clear (enhances woodgrain) |
| Pack Size | 20m² system pack |
| Components | 2-pack (base + activator) |
| VOC Content | 16 g/l (Low VOC) |
| Application Temp | 6°C–30°C |
| Max Humidity | 75% RH |
| Surface Temp | 3°C above dew point |
| Touch Dry | Min 8 hours |
| Overcoat Window | 1–4 days after dry (max 7 days*) |
| Certification | Available on request |
*Overcoat risk increases after 4 days. If over 7 days, abrade and spot basecoat again before overcoating.
Directions for Use
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Mix thoroughly and allow to stand for 30–60 minutes before use
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Use product within 4 hours of mixing
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Apply 1 or 2 coats as specified
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Follow with Thermoguard Fire Varnish Overcoat – interior or exterior, clear or stained
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Avoid condensation, ensure airflow and dry conditions until fully overcoated
Not suitable for floor surfaces subject to foot traffic.
Apply using:
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Brush (synthetic bristle)
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Short-pile roller
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Spray (conventional or airless – consult for tip sizes)
Data Sheets / Downloads
Thermoguard Fire Varnish 2k Basecoat - TDS
Thermoguard Fire Varnish 2k Basecoat Base - MSDS
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