Thermoguard Fire Varnish Overcoat Exterior
£155.40 (inc. VAT)
£129.50 (ex. VAT)
- UK manufactured, trusted brands
Thermoguard Fire Varnish Overcoat Exterior is a professional-grade clear lacquer designed for use over Thermoguard Fire Varnish Basecoat to protect timber and wood-based substrates in external environments. This solvent-based topcoat forms a tough, UV-resistant finish that enhances the appearance of natural or stained wood while contributing to fire protection systems tested to BS EN Class B s2 d0.
Ideal for applications where a durable, weather-resistant finish is required, it provides reliable performance as part of a complete fire varnish system. Use over basecoat to complete certification-ready, flame-retardant systems for cladding, paneling, soffits and more.
Surface Preparation
-
Ensure surfaces are clean, dry and free from contamination.
-
Wood must be fully dry with no more than 18% moisture content.
-
Fill joints and gaps with Thermoguard Intumescent Mastic.
-
Abrade existing sealed or varnished surfaces to create a key.
-
Refer to the Fire Varnish Basecoat TDS for base preparation
Technical Data
Specification Detail Finish Clear Matt or Satin Colour Options Clear or Woodstain Volume Solids Mixed product: 42–44% Mix Ratio 10:1 base:activator (by volume) Coverage Up to 10m² per litre (2 coats required for exterior use) Touch Dry 2 hours (min) Recoat Time 2–36 hours Pot Life 4 hours after mixing VOC Content High – solvent based Application Methods Brush, Roller, Conventional or Airless Spray Pack Sizes 20m² packs
Directions for Use
-
Apply first coat at 60 microns wet (30 microns dry).
-
Allow to cure for 2 hours minimum, then denib.
-
Apply second coat 2–36 hours after first coat.
-
If overcoating after 36 hours, abrade surface and allow to dry overnight before recoating.
-
Use conventional pressure pot spray or airless spray (11 thou tip). Thin up to 10% with Thermoguard Spray Shop Lacquer Thinners if needed.
-
Avoid contamination of basecoat.
-
Ensure application is in dry conditions (min. 6°C air temp, 3°C above dew point).
-
Max humidity 75%. Ensure good ventilation.
Data Sheets
Use collapsible tabs for more detailed information that will help customers make a purchasing decision.
Ex: Shipping and return policies, size guides, and other common questions.
