is plasti dip the best and most efficient way to black out my silver 2000 4Runner's rims

Depends what you consider efficient...cheap, reversible, and dont care about how it looks, yes.

I, however, would care how it looks and at the very least would sand and rattle can if not powdercoating.

Fastest way is turn the garage lights off!

Plastidip can be done and turn out like a professional paint job. Just saying.

I was just about to do this as well to see how it looks. I was also going to spray it down with Painter's Touch Clear Gloss to give it shine.

Oh, I fully agree, however, for 99% of the people who do it, especially with a rattle can vs a spray gun... its generally not the case.

what would be the best way then?

anthricite grey plasti dip looks great. The rest of the colors look kinda crappy IMO. I've plasti dipped a lot of stuff and bought a lot of stuff that came plasti dipped, and its always been a ***** to get off. I scrubbed my wheels with WD40 and a power washer for hours and ill still see bits that I didn't get off. Its okay for the price. Powder coat is gonna run $100 per wheel plus cost of removal and replacing the tire. YMMV

Exactly. For that cost I could spend 80 bucks more and have new wheels installed at a shop. I'm willing to try the plasti-dip first. It is definitely a pain to get off though once it has completely set.

I debated the Plasti-dip vs Rattlecan fix for my wheels for a while. In the end I decided to go with the Rattlecan fix, graphite metallic, with the Toyota symbol painted red to stand out more.

Ask yourself how often do you want to reapply plastidip or how picky will you be if some of it gets destroyed because its going to happen. I had black plastip on my previous car wheels for years. I always found something that bothered me with it.

My vote would be to prep the wheels as much as possible with sandpaper etc. and just rattle can with your favorite color or black.

I would vote for a thorough clean and paint rather than use plastidip. I just repainted my spare wheel last week using a flat black rust converter spray paint from Rustoleum and it turned out better than I expected. It was easy too (just as easy/difficult as plastidip would be to do well anyway). Here's the after shot (you'd probably want to follow this up with a top coat):

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Also, obligatory

I would sand and rattle can myself. most of the results come through based on your prep job though.

Best, no. Efficient, yes.

I wasn't pro-plastidip until after I used it myself and have lived with it on the truck for a while. Like you, I had contemplated powdercoating but I decided to try the dip first to see how it would turn out... especially since this is not a show car and I need it to have full utility still. Undeniably the best decision I've made that aesthetically made the most difference from a tired old truck to something I don't feel embarrassed to drive. All for the cost of a few hours and 8 cans from home depot. That's just me though.. to each their own.

I got rid of the chrome on each panel and sprayed them all. I am good with a can though but if you watch any of the videos that fonzie from dipyourcar has up, you will be able to handle this. There isn't much prep involved besides cleaning. I would highly suggest using dishwashing soap on what you are painting.

Here are my results. The marks you see in the before pics are from the weights needed to balance my old wrangler rt-s tires. New ones didn't take much at all so I just touched up the areas that needed it. I did 5 coats on everything. First 2 the color doesn't take. You slowly build the coats up and it will eventually have full color coverage. If you rush the job, it's going to come out like

I dipped my bumpers, wheels, & grill and have touched up each as they get marked up by shopping carts, wife, rocks, etc. Touching up is something you can not do with regular paints and especially not with powdercoating. When I went to put on the new tires, the guy at the shop kept asking me if I was ok with it getting marred up and that there would be issues where the weights were.

I've had plenty of rims on my past rides and I had anxiety anytime someone would have to work on it and especially drive it besides me. Not anymore! I can't even begin to tell you how many times I had wheels get scratched, curbed, or just wrecked by other people.

That turned out really well. I'm kinda sold on it.

Did you do the entire wheel, or only the visible surface?