Painting some outdoor Planters to match my siding and trim, want to ask some pros before i get too far in the project.

Material: Western Red Cedar

Products: Killz Original Exterior Primer, Sherwin Williams Emerald (I don't remember all the specifications I went with on it...I'd have to read the label I spent a good amount of time talking with the attendant to make sure I got an appropriate paint for the use. Also, I have a gallon of each so enough to do atleast several coats on 3 planters.

Material Prep: Planed all the surfaces smooth and sanded with 80 grit to get a touch smoother.

My experience with painting is pretty much limited to painting on drywall years ago when we were painting kids rooms. That was all rollers and imo as long as you got the tap done correctly it was pretty easy. I got my planters assembled and got primer on the under side it won't be visible, but didn't want to leave 1 surface open to the elements with no protection...it also gave me a surface to work out some technique. This Killz Original seems watery thin so I guess my first question is "Is this stuff supposed to look like chalk dissolved in water. The primers I've used in the past seemed like they were just an undercoat of paint with roughly the same consistency. It was pretty separated in the can when I opened it so I spent a good 10 minutes or so just stirring it until the consistency was even. This is roughly the type of planter I'm painting.

So my next question is about order. Do I paint trim first and then do the "body"? Or the other way around. I've got what I think is good frog tape to keep everything separated while painting. This is for me if there are small mistakes I can live with I'd just like it to look like someone competent (or atleast feigned competence) painted it. I appreciate any feedback I'm basically a complete noob at this I feel like I'd confidently paint the walls in my house, but I've never painted a wood surface, much less a softwood like cedar.