Duplicolor ceramic engine paint issues

Is it just me, or does the duplicolor engine paint w ceramic not dry to a gloss shine. I have painted a few parts so far, and the high closs does not dry high gloss, it dries dull and slightly rough. These are items that have been cleaned, and in the case of a timing cover, were sandblasted, cleaned, and primered with the duplicolor high heat primer. I used mopar rattle cans in the past, but that stuff was runny, and didnt cover well, but it was shiny. What do y'all use.