Nullifire TS816 Water Based Acrylic Topseal

Application Conditions
When applying Palatine Topseal, ensure that:
 The product specification is appropriate for your intended requirements.
 The basecoat is fully dried.
 The surface finish of the basecoat is suitable for overcoating.
 The correct dry film thickness (DFT) of basecoat has been applied before topsealing.
 The equipment is of correct specification.
 The site conditions and storage facilities are acceptable.
 You are fully conversant with the Application Instructions prior to use.

Preparation

Basecoat Condition: Ensure the Nullifire intumescent basecoat is fully dried and has reached the required Dry Film Thickness (DFT) specified for fire protection.

Surface Readiness: The basecoat surface must be clean, dry, and free from any contamination (dust, oil, or grease) that could interfere with adhesion.

Testing: Verify that the surface finish of the basecoat is suitable for overcoating. Intumescent basecoats can be moisture-sensitive; ensure the environment has remained dry.

Application

Environmental Conditions:
* Apply only when air and steel temperatures are between 5°C and 25°C.
* Relative humidity should be below 80% (ideally below 65% for optimum drying).
* Ensure the steel temperature is at least 3°C above the dew point to prevent condensation.

Method: Can be applied by brush, roller, or spray. For higher-classified environments (e.g., C3), applying two thinner layers (e.g., 75 microns each) is technically preferred over a single thick layer to avoid defects like pinholes or misses.

Timing: Only apply the topseal once the intumescent basecoat is “thumb-nail” resistant (typically 24–48 hours after the basecoat is applied, depending on its thickness).

Thinning: This is a solvent-based coating. If thinning is required for spray application, refer to the technical data sheet for specific solvent/xylene-based thinner recommendations.