Swain Technology, upstate NY, has a pearl white ceramic coating, which has the texture of medium to rough sandpaper, I painted mine with high temp black. The texture, according to Swain,is due to the ceramic particles in the coating
From Swain's web site:
" Like all of Swain Tech’s coatings, White Lightning™ is a performance improving coating. What makes White Lightning™ the best performance exhaust coating?
1) White Lightning™ really is ceramic so the material is a superior insulating material.
2) White Lightning is applied much thicker than any of the cosmetic coatings. White Lightning™ is applied about .015” thick compared to about .002” thick for the cosmetic coatings. Because White Lightning™ is the best insulating material and it is applied thicker than any other coating, White Lightning™ offers performance improvements that cannot be matched. "
http://www.swaintech.com/store.asp?pid=10969