Bowties,
First off..the original post on Mopar was from a Canadian guy that used Tremclad, which is owned my Rustoleum but is a Canadian company. It is similar to Rustoleum but apparantly there are some subtle differences.
As that thread progressed...someone decided to try a topside paint made for boats called Brightside...that is what I am using. It is meant to be brushed or rolled on but also be sprayed.
As to getting to those hard to reach places, the guys that use Tremclad/Rustoleum use a foam brush OR they are using a spay can of the matching color ( like door jambs, trunks etc,,)
I have my fenders, grill and bed off the truck so there are not that many places the 4" roller can't reach. I will be using a small foam brush for areas like the rain/drip rails on top of the cab and around wipers.
Did that answer your questions?
Chuck