Ceramic coating rust

The ceramic coating will drastically slow down the corrosion, but wont stop it. If the car isnt driven daily, and/or left where condensation can develop from temperature changes (especially the lower sections of pipe, not tucked into the engine bay), they will rust thru the coating. Uncoated headers on my truck (outside 24/7 in CT, driven every weekend) are still fine after 7 years. visually rusty, but no holes, or bad scaling. Same with the uncoated headers on my cuda (inside heated storage, driven a few times a year). But several cars I've worked with, stored outside, driven in summer only, the coated headers are speckled with rust. It's the same rust, but much more visible because of the smooth silver finish.