How to paint in high temperatures
Thread Content
When applying silicone heat-resistant paint to flue pipes at around 100 degrees Celsius, bubbling and peeling occur. What is the reason for this, and how can painting be done to prevent such phenomena?
You might want to give spraying a try. It should get better, I guess. Also, coatings similar to silver powder would work.
1. Before applying the paint, it is necessary to know the surface temperature at which it can be applied... One should not simply use paint designed for high temperatures. 2. The surface must first be degreased. 3. Spraying is recommended as the method of application. 4. Each type of paint has its own specific method of application...
At around 100 degrees, painting is not possible; it’s necessary to wait until the machine is shut down for maintenance in order to apply paint.
Apart from rust removal, the key issue is roughness; only with proper roughness can paint bond well to the substrate
Are you talking about painting under production conditions? What was the previous painting system like? How is the substrate surface treated? When using roll coating, the climate conditions are important to consider, as well as factors such as air humidity.
It was originally painted with alkyd paint, and then rust appeared. That’s why high-temperature paint was applied again; before painting, the surface was sanded (the manufacturer does not allow sandblasting during production, so manual rust removal was used, but only to remove the existing paint from the surface). But bubbles still form.
Shouldn’t the surface be polished smooth? With a large groove depth, will it work?
A few days ago I painted markings on the pipes; I bought alkyd blend paint from a grocery store. I really didn’t have any other white paint on hand at that time, otherwise I definitely wouldn’t have used it. Coatings that evaporate their solvents shrink and crack once they dry. I have no idea what the manufacturers of such paints are thinking; selling them is nothing but deception. Using them is simply the only option left. Fortunately, I only use it for labeling.