Top Seals and Primers

Nullifire has its own unique range of decorative top seals and corrosion resistant primers to offer a complete decorative protective solution.

Protection and decoration

System S intumescent basecoats provide a durable and attractive surface, similar to a paint finish. However, in a fire, they expand to many times their original film thickness. This provides an insulating foam-like coating or "char" to protect steelwork against heat build-up and the effects of fire.

Nullifire System S Basecoats form part of a 3-layer system, which consists of:

Primer

To protect steel against corrosion and prepare the surface. This provides a key for the application of the basecoat.

Basecoat

Applied to a measured thickness to provide the specified level of fire protection.

Top Seal

A hard decorative finish to seal in the basecoat and provide an attractive, high quality appearance.

Primer and top seal compatibility

It is vital that both the primer and top seal are compatible with the basecoat to ensure the integrity of the system in terms of fire performance and durability.

Nullifire has also tested and approved primers and top seals from other manufacturers for compatibility with System S Basecoats. However, it is essential to check overcoat timings and other relevant data with the coating manufacturer concerned. Nullifire strongly recommends that a primer and top seal compatibility check is carried out prior to application.

If you are in any way concerned about the compatibility of specific primers or top seals with System S Basecoats, please contact Nullifire Technical Services Department.

Application

System S Basecoats are ready for use. No thinning is required. They are easy to spray using conventional airless manual or automated spray systems. They may also be applied by roller or brush, using a "laying on" technique to avoid heavy brush marks.