Intumescent paint is used in many types of construction including new construction, retrofit and defective building construction, and historic restoration/renovation construction. Specifically, our intumescent paint can fire rate interior structural steel, gypsum, and wood.
Ventilation is recommended to allow the intumescent coating to properly dry/cure. If no ventilation is available, a small fan can be placed in the area to circulate the air flow.
Do not exceed a relative humidity of 95%. High humidity levels will increase drying time, affect adhesion and can cause blistering in the coating.
The fire coating can be brushed with a high-grade latex paint brush. It is recommended that the coating is brushed in smooth even strokes.
For a faster and smoother application it is recommended that applicators use an airless paint sprayer.
To ensure proper adhesion of the intumescent coating, the substrates need to be free from dirt, oil, grease, and any other substance that can affect the adhesion of the intumescent coating.
The intumescent coating must not be diluted. It is recommended that the coating be mixed with a paddle mixer for 1 to 3 minutes.
Do not exceed WFT of 45 Mils (1.16mm) by spray application, or WFT of 15 Mils (0.38mm) by brush application, per coat. WFT is dependent upon relative humidity and airflow.
Typical spray distance from substrate to end of spray gun is between 24” and 36”. This spray distance will ensure a smooth spray application of the intumescent coating.
The recommended drying time between coats is 8 hours. Applying coats prior to 8 hours can cause blistering of the intumescent coating. The surface must dry and harden so you are not able to press your finger nail into the coating and create an impression. If you can make an impression then the coating is not dry.
Spray Application Based of 40 (WFT)
A top coat is not required for conditioned interior space unless it is for a desired color. Once the product is cured, it may be top coated with latex, acrylic, or oil based paint.
The damaged area should be cleaned and dried. The intumescent fire coating can be applied directly to the damaged area with the proper mil thickness to repair the area.
Trying to determine paint coverage with an intumescent paint can be tricky. Intumescent paint coverage rates are based upon Dry Film Thickness (DFT). DFT varies depending on the type of substrate and, in the case of structural steel, the specific steel members being coated. Please contact a FlameOFF Representative to figure DFT and coverage rates for your particular project.
Tip plugging is caused by solids in the paint that are too large to pass through the tip orifice. Diluting or thinning paint does not reduce the size of the solids. Here is a list of things you can try in order to avoid tip plugging.