Bollom Intulac Ultra Topcoat

Bollom Intulac Ultra Topcoat is used as the finishing stage of the Intulac Ultra system where timber in communal areas and other interior spaces requires a clear fire protective treatment.

The specified three-coat system achieves Class B-s1, d0 to BS EN 13501-1:2018. This reaction-to-fire classification applies to the complete coating system:

• B describes the system's limited contribution to fire under the specified test conditions
• s1 indicates low smoke production during testing
• d0 indicates no flaming droplets or particles during the specified test period

Suitability

For suitable interior softwoods, hardwoods and wood derivatives, including plywood, chipboard, fibre insulation board and hardboard. Bollom also specifies veneering at least 9mm thick. Previously varnished surfaces must have sound adhesion and meet the manufacturer's preparation requirements.

Not suitable for surfaces exposed to mechanical stress, such as doors, floors or stairs. Always follow Bollom's specification for the surface being treated.

Use the following basecoat beneath Intulac Ultra Topcoat to complete the specified system.

Product Use Bollom Intulac Ultra Intumescent Clear Basecoat Expands when exposed to fire, forming an insulating layer that helps protect the wood beneath.

Apply only over Bollom Intulac Ultra Intumescent Basecoat. Complete any cleaning, repairs and preparation of the underlying wood before applying the basecoat, following Bollom's specification for bare or previously varnished timber.

Older paint coatings, particularly those applied before the 1960s, may contain lead. If these are present, seek advice on safe preparation before sanding or stripping.

1. Remove dust, dirt and surface contamination before applying the basecoat
2. Remove oil, wax, grease and release agents using a suitable cleaning product like Zinsser Universal Degreaser and Cleaner, ensuring no cleaning residues remain and the wood is dry
3. Check existing varnish for sound adhesion and remove any loose or flaking areas before applying the specified basecoat system
4. Check for cracks, holes and damaged timber, and complete any necessary repairs before coating. Confirm suitable fillers and repair materials with Bollom so they remain compatible with the fire protection system
5. Apply the required basecoat coats at the specified coverage rate for bare or previously varnished timber
6. Before topcoating, ensure the basecoat is dry and free from dust, oil, wax, grease and other contamination
7. Allow at least 48 hours after the final basecoat coat, and apply Intulac Ultra Topcoat within a maximum of 4 days

Always apply to a small test area before starting to check compatibility and the finished appearance. Follow the instructions on the tin and Bollom's specification for the complete fire protection system.

Apply when the surface temperature is between 10°C and 40°C, with relative humidity no higher than 70%. The surface must be at least 3°C above the dew point to prevent condensation. Ensure good ventilation and keep away from heat, sparks and naked flames.

1. Stir thoroughly before use with a suitable tool like the Mako Paint Stirrer
2. Apply undiluted over the prepared Intulac Ultra Basecoat, allowing at least 48 hours and no more than 4 days after the final basecoat coat
3. Apply one coat at the specified coverage rate of 20m² per litre to complete the system
4. Use a fine natural bristle brush or short pile lambswool roller
5. For larger areas, apply with a short pile mohair roller, then lay off with a brush in the direction of the wood grain

Airless Spray Application

1. Apply undiluted using airless spray equipment with a pump ratio of at least 30:1
2. Use a hose with an internal diameter of at least 3/8 inch, reserved for solvent-based coatings
3. Use a nozzle size of 0.011-0.015 inches (0.28-0.38mm)

At approximately 20°C and 60% relative humidity, the coating is through dry in around 6 hours. Lower temperatures and higher humidity will extend drying times. Do not stack timber components treated with the Intulac Ultra system.

Clean equipment immediately after use with TH19 Thinners or xylene-based thinners. Do not use white spirit.

Keep the finished coating free from dust using a soft, dry cloth. Avoid abrasive pads, harsh cleaning products and solvent cleaners that could damage the finish.

Check periodically for scratches, peeling or other damage. If repairs or redecoration are needed, contact Bollom for advice on restoring the specified fire protection system before applying further coatings.

How do I get Fire Certification?

Keep proof of purchase, the batch numbers of the products used and your site details. Submit these through Bollom's website to request the relevant Certificate of Supply, which Bollom states will be sent within 5 working days. For assistance, contact Bollom's Customer Services Department on 0191 410 6611.

What fire rating does Bollom Intulac Ultra Topcoat achieve?

The specified system of two coats of Intulac Ultra Intumescent Basecoat and one coat of Intulac Ultra Topcoat achieves Class B-s1, d0 to BS EN 13501-1:2018. This rating applies to the complete system on suitable surfaces, applied at the specified coverage rates.

Can I apply Intulac Ultra Topcoat directly to bare wood?

No. It must be applied over Bollom Intulac Ultra Intumescent Basecoat. The topcoat alone does not provide the complete system's tested fire protection.

Can the Intulac Ultra system be used over existing varnish?

Yes, on suitable previously varnished surfaces where the existing finish has sound adhesion. Apply the specified basecoat system before topcoating. The required basecoat coverage rate differs for bare and previously varnished timber, so follow Bollom's instructions for your surface.

How long should I wait before applying the topcoat?

Allow at least 48 hours after the final Intulac Ultra Basecoat coat, then apply the topcoat within a maximum of 4 days. Ensure the basecoat is dry and free from contamination before application.

How many topcoat coats are required and how much will a tin cover?

Apply one coat at the specified rate of 20m² per litre. A 500ml tin therefore covers 10m² at this application rate. Do not spread the coating more thinly to increase coverage.

Can I use Intulac Ultra Topcoat on doors, floors or stairs?

No. Bollom excludes surfaces exposed to mechanical stress, including doors, floors and stairs. The product is for suitable interior wood surfaces and must be used with Intulac Ultra Intumescent Basecoat.