Thermo Tech? What kind of coating is that?
Ceramic coating is all in the prep, and any decent company should do whatever is necessary to properly clean, blast, whatever needs to be done to get a good surface. This assumes that they're professionally applied coatings, like Swain Tech, HPC, etc. I don't really think you can do a proper ceramic coating like that, and that's probably why you're having durability problems. The really good coatings are usually applied with a plasma stream, which is much more durable and better bonding than any water born or solvent born coating. Water born or solvent born coatings have their place though, for coating lower temp parts and things like sheet metal and plastics/composites.