Ceramics typically have very high melting points, low thermal conductivity, and great resistance to heat.
That said, the amount of heat a ceramic coating can take depends entirely on the product and its constitution.
- What kind of ceramic particles are there?
- What’s their concentration?
- What polymers are used to bond the whole thing together?
- What application and curing method is used to bond the coating?
Let’s get this out of the way: the ceramic coating you apply on your body panels as paint protection is not the same as the ceramic coating you apply on manifolds, headers, turbocharger housings, and other components of your exhaust system.
It doesn’t matter if it’s a spray formula, traditional nano-ceramic liquid product, DIY, or professional-install only - it’s not the same stuff. Paint protection ceramic coatings will not work at all if you put them on your exhaust.
Most paint protection ceramic coatings - even the high-grade products - are not reliable beyond 500 degrees F.
There are specialized coatings for wheels and brake calipers that are designed around the heat and brake dust emitted from the braking system. These are suitable for coating exhaust tips, where EGTs are the lowest.
For the actual manifold or headers, turbo, downpipe, and other components, you definitely need to use a specialized high-temperature ceramic paint. Depending on their grade, these can endure temperatures of up to 2,000 degrees F, which is to be expected from a high-strung performance motor.