During the construction process of organic high-temperature resistant coatings, the following methods can be used to avoid foaming problems:
Preparation stage before construction
In terms of substrate processing:
Thoroughly clean the surface of the substrate, removing oil stains, dust, rust, and other impurities. For example, for metal substrates, organic solvents such as acetone and toluene can be used for wiping to remove oil stains. Then, sandblasting and other methods can be used to remove rust and increase surface roughness, ensuring a smooth, dry, and clean surface. This can reduce the occurrence of bubbles caused by poor adhesion between the coating and the substrate due to unclean substrate surfaces.
For some porous substrates, sealing treatment can be carried out in advance, such as using a suitable primer for priming, filling the pores of the substrate, and preventing air from escaping from the pores and forming bubbles during subsequent application of organic high-temperature resistant coatings.
Paint blending process:
Strictly follow the ratio requirements of the coating product manual to prepare the coating. If it is a multi-component coating, the amount of each component should be accurate and correct to avoid incomplete reaction or unstable components inside the coating due to improper ratio, which may cause foaming.
During the mixing process, the coating should be stirred slowly and thoroughly to minimize the mixing of air into the coating system. After stirring, the coating can be left to stand for a period of time to allow the air mixed in to naturally escape and reduce the air content in the coating. At the same time, if a diluent is needed, the amount of diluent added should also be controlled to avoid excessive dilution, which can lead to poor stability of the coating and easy foaming.
Construction operation process
In terms of construction method control:
When brushing: a gentle and even brushing action should be used to avoid brushing too quickly or too violently, which may cause air to be sucked into the coating and form bubbles. At the same time, after each brushing, a brush can be used to gently smooth the surface of the coating, promoting the discharge of mixed air and reducing residual bubbles.
When spraying: it is necessary to adjust the parameters of the spray gun reasonably, such as reducing the air pressure to an appropriate range, to avoid excessive atomization of the coating caused by excessive air pressure, which can lead to a large amount of air mixing into the coating and adhering to the substrate to form bubbles; Maintain an appropriate distance between the spray gun and the substrate, generally controlled at around 15-30 centimeters according to the type of spray gun and the characteristics of the coating, to prevent the coating from rebounding and forming bubbles when it impacts the substrate too close, or causing uneven atomization of the coating and air inclusion when it is too far away. In addition, when using multi-layer spraying, wait for the coating to dry slightly after each layer to allow enough time for air to escape before proceeding with the next layer of spraying.
During immersion coating: Control the speed of immersion coating and avoid it too fast. Let the workpiece slowly immerse in the coating to reduce the amount of air carried into the coating. After the workpiece is removed from the paint, it can be shaken or tilted appropriately to allow excess paint to naturally flow back to the paint tank, while also helping to remove bubbles. It is also necessary to ensure that the workpiece is naturally dried in a well ventilated environment for a period of time, allowing the air in the coating to fully escape before proceeding with the subsequent curing treatment.
In terms of coating thickness control:
Follow the thickness requirements for each layer of coating specified in the paint manual to avoid excessive coating thickness. Because during the drying and curing of excessively thick coatings, gases generated by internal solvent evaporation are difficult to be discharged smoothly, which can easily accumulate and form bubbles. Generally, multiple thin coatings are used, and the next layer of coating is carried out after the previous layer is fully dried or dried, which helps the air in each layer of coating to escape in a timely manner and reduces the risk of foaming.
Post construction processing stage
In terms of drying and curing:
Choose appropriate drying and curing conditions, such as temperature, time, and other parameters, strictly in accordance with the requirements of the coating product. To avoid rapid evaporation of solvents and other components inside the coating due to excessive temperature, and to prevent the formation of bubbles due to the rapid gas generation rate; Or if the temperature is too low or the time is insufficient, the coating may not cure completely, and the residual volatile components inside will slowly evaporate and form bubbles during subsequent use.
During the drying and curing process, ensure good ventilation in the construction environment to facilitate the timely diffusion of gases generated by solvent evaporation to the outside and reduce the possibility of bubble formation inside the coating. At the same time, keep the environment clean and prevent dust and other impurities from entering the coating, affecting the discharge of bubbles or causing other quality problems.
Through the meticulous and standardized operation of the above steps, the occurrence of foaming problems during the construction process of organic high-temperature resistant coatings can be effectively reduced.

Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150K.    
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.