You need a second coat. Otherwise you will create the opposite effect basically. You have darker spots where you touched it up. The good news is a second coat is usually a second coat goes much faster.

OK - Thanks for the advice...

The room I'm painting is around 310 sq. ft. and the Marquee says coverage "up to 400" but I was barely able to cover the room. Do you know why that might have happened and if a second coat typically uses less paint?

In trade those spots would be called holidays. That’s quite common when you only apply one coat. The standard is two coats. When a wall is painted with two coats the finish is more durable.

400 sq ft is just optimistic advertising .... it depends on how thin you roll on the paint, how much texture your wall has, how thirsty the wall is, and what your tolerance for white specs is.

I've found I always need a 2nd coat. Even if I press the roller into the wall really hard on the 1st coat, I'll still get white spots and I'll also get a really awful 1st coat texture/finish. So 2 coats it is. I usually go for the slightly thinner Behr Premium to save money, because thinner paint is easier to roll on and has a better finish.

2nd coat typically uses less paint

It really depends what color was going on what color, and how decent of a job you did.

I just did a first coat today (light color over white), in a closet actually. I’m not planning on doing a complete second coat tomorrow, and just doing some spot touch ups; unless there turns out to be a lot of missed spots.

I’m some cases you can do spot touch-ups, in others a second coat is the way to go.

You will learn with experience. I know that sounds dumb, but it really is true.

This.

Source - me finishing my basement and using 26 gallons of paint.

Always two coats, no matter what the paint can says. It would be way more work trying to touch up paint with a roller, and there'd be spots you'd miss. I mean, by the time you stand there with a light and examine the entire wall and fiddle with it, you could have painted the entire room again, easy.

In all my years I have never seen a paint that covered in one coat. I've tried the paints, the rollers, it doesn't work. It's close but it doesn't work. Just grab another can and put a second coat on it and be done with it. What looks good now won't look good tomorrow morning as you discover new areas that need a touch up. Then another. Then were you cut in stands out. My standard is prime, then paint 2 coats. Rarely have I ever had a problem.

Yes you can.

But I also look at it this way, do I have enough paint for a second coat? Because I'd rather just paint the room again rather than worry about how to dispose of leftover paint LOL.

And to be honest you start noticing more spots over time.

And in the future, just FYI unless there is a very specific reason to use Killz, like for example you bought a house where people previously smoked, it's usually better to not prime and just do two regular coats. Because the primer can just cause a situation where you need to paint more.

I had this issue as well, with exactly the same brands. I did a second coat very thinly over the whole wall, using a foam roller. I also watered down the paint slightly per the instructions on the can. It looks pretty good now. The problem I ran into was that the regular nap roller was missing the same spots the second time over. Hence, foam.

There is no such thing as one-coat coverage.

Repeat after me: there is no such thing as one-coat coverage.

REPEAT AFTER ME: THERE IS NO SUCH THING AS ONE-COAT COVERAGE.

There are not, have never been, and CAN NOT BE such a thing as a paint that achieves full coverage in a single coat. It's not even a proterty of paint, it's a restriction governed by laws of physics.

Every single statement to the contrary made by every single paint brand is nothing short of an outright lie.

My painter friend says all paints require 2 coats, regardless what it says on the can.

The first coat absorbs into the primer, so you lose a little. The second coat spreads thinner, plus you don't need a since you're already about 95% covered.

You'll be surprised how much of an improvement it will make.

Never have found a one coat paint. Your Friend I'd correct

Try it on one spot and let it dry to test. Rarely and with the right technique (so the roller rolls and doesnt plane) it can work with one or two spots.

Though in most cases (and when testing isnt an option) i agree, a second coat is pretty much your default go-to.

Recently painted a whole house with that exact paint. You'll need another coat. I did 1 coat in my bedroom and tried to touch up 2 light spots and they're now noticable darker. Even tried to sand them down a bit and it helped but the sheen is slightly duller now in those spots. I hate painting more than I hate those spots, and 1 is covered by my headboard so I didn't go back. Also keep in mind the 2nd coat will be a smidge darker in case you weren't planning on doing all the walls in the room

In my experience a 2nd coat will make more of a difference that it would first seem. I always do a 2nd coat. I've tried to not do but it just doesn't look nearly as good.

Second coat. You won't regret it. Also stick with the behr- it's my go to, but I recently used the Lowe's brand out of convenience ... BIGGEST MISTAKE OF MY LIFE.