Will regular spray paint peel off under high temperatures?

[ThomasLynn]

There's no issue with moderate heat. Under high heat, spray paint will first blister and crack. At even higher temperatures, the paint surface will also bubble and crack. Below is some related information about spray paint: Uses: Spray paint has extremely wide applications. With recent economic development, its uses have expanded from initially repairing paint flaws to molds, industrial machinery, toys, crafts, musical instruments, buildings, steel structures, advertising and promotional industries, signage, graffiti, and various other sectors. Even in less industrialized pastoral areas, spray paint is used—reportedly to distinguish livestock herds among different breeders by color. Composition: Aerosol paint (spray paint) typically consists of an aerosol can, aerosol valve, contents (paint), and propellant, along with an agitator ball (marble) inside the can to aid in mixing.

[SanEmiliano]

I work in auto body repair, and regular spray paint definitely can't withstand high temperatures. Last time I repaired a motorcycle exhaust pipe, the customer had sprayed it with silver paint themselves, and after riding for just half an hour, it all bubbled and peeled off. Parts in the engine compartment and the exhaust system of a car can exceed 150°C in the summer, while store-bought spray paint starts to soften at 90°C. If you really want to paint high-temperature components yourself, you need to buy the red-can high-temperature specialty paint. It costs three times as much but can withstand 400°C. During application, make sure to clean off any surface grease, allow 15 minutes between each coat, and let it sit for 24 hours after spraying before use.

[AdamMarie]

Having seen many cases of paint failure in auto repair shops, regular spray paint will inevitably peel off when exposed to high temperatures around the engine. Metal surfaces can exceed 75°C in sunlight, while the inside of the hood can surpass 130°C, causing ordinary paint films to wrinkle and crack. The exhaust pipe is even more extreme, with the tailpipe starting at 200°C—original manufacturers use special ceramic paint for these parts. It's recommended that car enthusiasts avoid painting high-temperature areas when changing colors. Wheels should use wheel-specific paint, and calipers must be coated with high-temperature brake paint. I've seen cases where regular paint was used on turbo heat shields, only to turn charred black after a single highway drive.

[SanAllie]

After a decade of modifying cars, I've found that the heat resistance of spray paint is its Achilles' heel. Regular paint becomes sticky above 80°C, making it completely unsuitable for engine bay components. Last year, I tried spraying an intake manifold with so-called 'high-temperature paint' bought from an auto parts market, but it still peeled after continuous driving. Later, I discovered the truth: genuine high-temperature paint cans are labeled 'High Heat Resistant,' contain ceramic microparticles, and require curing at 200°C. Now, I only dare to use it on ambient-temperature parts like wiper brackets, while chassis components must be primed with epoxy base coat first.

[DelJosiah]

A colleague used regular spray paint on the brake calipers, which developed cracks within the first week. In summer, brake discs can reach temperatures of 300°C, while ordinary paint films begin to carbonize at 140°C. Professional procedures observed include: wiping three times with a degreaser to remove oil films, sanding to create roughness, spraying epoxy primer followed by baking for 20 minutes, and finally applying a high-temperature topcoat containing aluminum powder. For DIY projects, it's recommended to use exhaust-specific paint, such as VHT brand, which withstands up to 650°C, with silver being more heat-resistant than colored options. After application, three heat cycles from driving are required for complete curing.

[MacAdrian]

A test was conducted during the renovation of a home garage: ordinary black spray paint applied to the exhaust pipe bubbled and peeled off after running the engine for just 10 minutes. Consulting a friend in the chemical industry revealed that the acrylic resin in ordinary paint decomposes at 120°C. High-temperature-resistant paint contains silicone resin or ceramic components. For engine covers, a paint resistant to 200°C can be chosen, while exhaust pipes require a 400°C grade. Key reminder: Before spraying, treat the metal with rust remover, wear a gas mask during application, and maintain a spraying distance of 20cm to prevent sagging. Repair shops charge around 300 yuan for fixing such peeling paint, so it's better to directly purchase heat-resistant paint.