There are folks who heat their coating to get it to flow out better for that bit extra gloss but more people dont heat the coating than do. If you dont have a coater on your press you either have to get an offline coater, they are very common and are reasonably priced or convert your last print unit to be able to either print or coat, there are some aftermarket comanys selling print unit/coater conversions but they are not cheap. Some people have converted the dampening system into a coater applicator but I have no experience with that so cannot comment.