I did kind of a quick and dirty fluid film job on my new to me 2019 classic right after I got it in July. I only had about 1 and a quarter quarts of FF on hand at the time.
Just yesterday I did a full blown Woolwax job on it. I've got the system down given this is about the 4x I've done a 4th gen Ram 1500.
Woolwax is best to do on a hot day, especially if it's going to be warm and rain free for a while. This will give you the best results.
All the doors have two large rectangular shaped drain holes you can access under the weatherstripping to get product into the bottom of the doors. I just blow it straight through with the short tip on the gun. You'll see mist come out the drain on the other end of the door bottom. Same with the tailgate. The tailgate has a few other access holes you can use with the wand.
The rocker panels are so easy because of all the huge access holes. Most have tape on them from the factory, but the tape is kind of pointless given all the wide-open holes that aren't taped.
To do the best job possible in the back, you need to pull the rear fender liners to get into all the nooks and crannies inside the liners. I think it's 11 bolts each. They come out w/out having to remove the rear wheels.
You're always going to miss areas, which is why yearly re-sprays are important. I would think if you do a really good job 2-3 years in a row with woolwax, you could probably skip a year here and there.
My truck has the lovely woolwax smell from 15 feet away. WW does smell very nice compared to FF.
