What kind of paint is used for engine painting?
3 Answers
Engines are heat-generating bodies and cannot be painted. Here is some information about engines: 1. Introduction: An engine (Engine) is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. For example, internal combustion engines typically convert chemical energy into mechanical energy. Engines can refer to both the power-generating device and the entire machine including the power unit (e.g., gasoline engines, aircraft engines). The engine was first developed in the UK, so the concept of the engine also originates from English, with its original meaning referring to "a mechanical device that generates power." 2. External Combustion Engine: An external combustion engine means that its fuel burns outside the engine. It was invented in 1816 by R. Stirling of Scotland, hence it is also called a Stirling engine. The engine converts the thermal energy generated by this combustion into kinetic energy. The steam engine improved by Watt is a typical example of an external combustion engine. When a large amount of coal burns to generate heat, it heats water into a large amount of steam, creating high pressure. This high pressure then drives mechanical work, completing the conversion of thermal energy into kinetic energy.
Last year, I tried painting my old car's engine myself. First, I learned that regular automotive paint wouldn't work because engine temperatures can exceed 200°C, causing ordinary paint to bubble and peel under heat. You need specialized high-temperature paint, such as industrial-grade heat-resistant spray paint or automotive high-temperature enamel, which can withstand temperatures above 150°C. I bought an epoxy resin spray paint in a can, which was easy to use. Before spraying, remember to thoroughly clean the engine surface, removing oil and rust, then apply the paint evenly. Avoid spraying on a hot engine to prevent accidents. Darker colors are better at hiding dirt but may lack shine—I used matte black, which worked well. After finishing, the engine looked brand new, and over a year later, the paint remains intact with no cracking. I recommend checking the product specifications beforehand to ensure it meets high-temperature requirements.
Having worked in an auto repair shop for several years, I've noticed that engine painting requires special heat-resistant coatings, such as ceramic-based high-temperature paint or corrosion-resistant industrial paint. Regular paint melts under high temperatures, but professional products can remain stable in continuous 130-170°C environments, protecting the engine from rust and corrosion. The key lies in adhesion—I've seen cases where cheap paint was used, leading to peeling that blocked cooling vents. I recommend using reputable brands of high-temperature spray paint, like 3M's. Before spraying, sand the surface to ensure it's free of oil and dust; two thin coats usually yield good results. Be careful not to spray onto electrical circuits or air intakes to avoid short-circuit issues. The cost is reasonable—a can costs just a few dozen yuan and is sufficient. For a more professional finish, using a spray gun can save paint.
