For newly constructed walls, the best drywall primer is not the most expensive primer. For new walls (with no stains etc) you do not need a stain-blocker or a hole-filler. And the best drywall primer is less expensive than other serious primers. See our top 3 choices just below.
- Why you need it
The drywall paper and the drywall compound (“mud”) are both porous surfaces but they absorb paint at different rates. If you do not equalize them with a primer made for this new wall, you will see the difference and it looks sloppy.
- Why you don’t need to overdo it
High-quality primers are not that expensive and do not contain additives that are expensive. Buy just what you need, as overkill will just be a waste of money.
All you ever needed to know about the difference between sealers, primers, and undercoats in one short article from some good kiwi people in New Zealand.
The Best Drywall Primer for the Money
Don’t buy these online: shipping is crazy high: but you can learn a lot from the “tech details’.
Even the best drywall primer does not have a lot of firepower (explained below). But we don’t believe in cheap paints: they cost more in the end: so just get what you need to do it right and save your money for the cool shops in Acapulco.
- If you have a Benjamin Moore store near you, our first choice best primer for drywall is low odor, zero-VOC, 100% acrylic interior latex drywall sealer with spatter resistant properties: Benjamin Moore Super Spec Undercoat & Primer Sealer Interior Latex
- If you have a Sherwin Williams store near you, go with S.W. Drywall Primer. Probably more toxic than the above so use in a well-ventilated area or wear your respirator (here more about paint mask respirators): Sherwin Williams Drywall Primer Interior Latex
- Besides the two above, other paint companies cannot compete: we have had bad luck and find most paints to be too toxic. If the two above are not available, we like Kilz PVA Drywall Primer:
Remember cheap primer and cheap paints use toxic ingredients. Read the label and read more in my post about the deadly VOCs.
Important tip: With your drywall primer, use a quality roller, not a low-cost one! Cheap rollers shed lint onto your wall which will cause your wall to feel (and look) like sandpaper. Not only that but rollers are easy to clean. You can soak a good roller cover for days in water and let most of the primer or paint fall to the bottom of your bucket. You can then rinse and even put back on your roller frame to spin it dry. Easy.
We use Purdy and Wooster wool/poly blend rollers. The wool gives it absorbancy and the polyester gives it longevity. We use a single roller all day, day after day. Read my other painting tips on tools that will save you time and money.
How to Prime Drywall in 4 steps
Step 1: Inspect the walls and fix cracks
Step 2: Clean
After the joint compound is all sanded the first thing to do is to dry brush the dust off the walls (it clings). Then, without stirring up too much dust, gently sweep the floor. You can use a Shop-Vac with a paper filter, (not your house vac: it will die), then mop the floor.
Step 3: Priming drywall
Apply 1 coat of your chosen drywall primer sealer (see below).
Step 4: Wait until the primer is dry
All drywall primers are relatively fast drying. Drying time depends on lots of factors like ventilation and humidity.
You only need to apply 1 coat of drywall sealer primer. Don’t delay too long after it is dry before the next coat or before painting.
How to Prime Drywall in Detail
New drywall requires 3 coats? Mostly yes, and the first must be a drywall primer sealer. There is good news coming below, however about that primer. Having said that, painting brand new walls is the only time I’d consider using a paint and primer in one, which may save you one coat of paint. See the section on Paint and Primer in One below. This is definitely not the best drywall primer. If you do, buy a quality paint and primer in one: use Kilz, a very good name in drywall sealer, and for sure one of the best paint and primer in one. I would trust this product, it is also a primer with low VOCs.
For you traditional 3-coaters, the first good news is that you don’t have to buy some exotic or expensive primer (assuming you have no mold or stains) for priming drywalls. You don’t need oil-based primer either. The best drywall primers are the lowest-cost primers, as they contain only what is needed: a normal drywall sealer do not need ingredients to seal stains, odors, mold, etc. If your unpainted drywall has been waiting for a long time, especially in a basement, it may have sprouted some mold or mildew. In this case, you’ll need a little more firepower. If so, you’ll need to read the last section of this post.
Why not just put on 2 coats of paint? One word: Flashing. Because you will see the seams (and screw holes, tape and bead) where the joint compound a.k.a. ‘mud’ meets the paper that is the outer face of the rock. The paper and the drywall compound are a similar porous surface but they absorb paint at different rates (this goes for every coat of regular paint that you might apply without a drywall primer sealer).
Yours Truly learned the hard way: I know you can end up with terrible flashing! So the drywall primer sealer is designed with just the right sealants to stop the different rates of absorption and there will be no difference in sheen or color changes in your finish paint.
Some painters say leftover flat (and only flat) paint is as good as the best drywall primer and will give a good result. Hmm. Proceed at your own risk. I have never found this to work out but I need to make the job perfect: perhaps you don’t.
More good news: you do not have to apply a normal heavy coat of paint as you will with your top coats; you just need to give the new wall a drink, and the job is done. Get the can of primer well shaken (or stirred, Mr. Bond). This coat can be very fast: you will be done in half the time of painting one of your top coats. Calculate that into your expected quantity (but all paint seller accept unopened cans in return). Even the very best drywall primer does not have to be a heavy coat: just a film will do.
Important first step: clean the room before you paint! After the joint compound is all sanded the first thing to do is to dry brush the dust off the walls (it clings). Then, without stirring up too much dust, gently sweep the floor before painting. You can use a Shop-Vac with a paper filter (not the kind that just has a hollow can for debris unless you like clouds.)
Do not use your good vacuum: this dust will kill it !!
Then after the floor is mostly clean, mop it. Yes, mop. You don’t want to be kicking around the dust as you finish your paint. This fine dust seems harmless but it will stick to freshly painted walls and turn your new project into vertical sandpaper: ick.
Wear some kind of mask. For non-toxic dust, a honeycomb mask will be fine.
Paint and Primer in One: not the best drywall primer!
Probably ok for your home use, but I cannot say for sure that with paint and primer in one you will not see the difference in the sections of the wall: joints vs. paper, but feel free to try. It is not the best drywall primer solution, but for walls in good new condition, some paints do promise to equalize the surfaces at the same time they leave your color.
I understand you may be very tempted because you have painted before and you want to cut out a whole coat. But remember that the result will not be the same as a traditional 3-coat job using the best primer for drywall. Here a more complete post on paint and primer.
Some common questions on how to prime drywall:
- Can I use regular house paint as a primer?
Yes, but no. You will have the blotchy look we discuss above, but you will save the cost of the new primer. Don’t use exterior paints though, as they are very toxic inside a house. If going this way, try to use flat paint.
- Can I spray?
Yes, and we do this in large newly constructed rooms. This means renting or buying a sprayer, but it can save loads of time. You need to know what you are doing or be ready to get stuck in a time sink. This is especially fast for highly textured walls.
- Can I use spray cans?
Yes for small areas: if you find some imperfections on your wall after you paint and you’d like to quickly prime it, a small can of spray primer may be just the thing. Be aware that most spray primers contain more than you need to seal drywall and will be very hard to clean off if they go astray in the air so mask the floor etc.
- Can I use drywall primer on wood?
No, you probably need a shellac in our first coat product. Most wood will have sap (which will bleed through a simple primer like drywall primer and every coat of paint you put on after that. Also, the wood’s tree rings that absorb at different rates (the dark ring vs the light ring). Why is that bad? The softer ring will expand differently as the primer dries and you will not be left with a smooth surface. We use BIN alcohol-based primer, a white shellac, when priming almost all woods. For that, you need rubbing alcohol for clean-up.
- How long do I have to wait after priming drywall to paint?
Especially with drywall, you will find that the ‘mud’ and the paper of the main sections dry at different speeds. You can easily tell when the last of the primer is dry, usually an hour or two. Don’t rush this step! All drywall primers are relatively fast drying.
Some paint makers will say you must paint within 48 hours after letting the primer dry, but I have never seen any problem waiting longer with the best drywall primer. Dust clinging to the wall while you delay is the only real problem: just use a broom and vacuum and/or mop (see above).
- Can I use a primer (or any paint for that matter) to fill small cracks?
Not really. Some high hiding primers exist and they will fill more cracks than other primers, but at what cost? Drywall primer is cheap so we just fill cracks by hand. If you do manage to have some very small cracks go away after painting, you will find they re-crack quickly in time.
Remember that the wall will have the same contour after it is painted as it did before. Cracks can be caulked (usually just for corners) or spackled (some quick dry spackles will not shrink-they cost more but they are all we use). You can always apply drywall compound to a crack, wait for it to dry and re-sand. We normally use quick-dry spackle and quick dry caulk as we cannot wait.
- Can I tint my drywall primer?
Definitely, we do this if we are in doubt about the chosen color’s ability to cover in two coats. That tinted primer is very smart as long as the paint store folks do not ruin the primer’s properties by overtinting it. You will not get your top-coat color because the paint store folks will not be able to add as much tint as they would with paint. (Don’t tint it yourself!)
Especially if you are about to paint with a red, and that includes red-browns, tint your primer gray. Red is notorious due to the colorants that are used to achieve your color, almost all shades of red do not cover well. For some reason a chemist can tell you, the gray primer allows the coverage to maximize.
- How can I achieve a Level 5 Drywall finish?
You may have heard of different levels of finish, including Level 5 drywall (the smoothest) or skim coating, and so on. A great website for all you ever need to know and more is drywall101.com. It’s all well described on youtube: if you can afford it, this is the very best drywall for your home. This goes beyond the best drywall primer for $ure.
Mold or Mildew on Interior Walls
If you just put normal drywall primer sealer over mold (or the black type called mildew), it will continue to grow and that is a two-way street—mold grows into and behind the wall and moves around anywhere that air can penetrate.
So if see mold and you have started painting, you must stop seal it as soon as you see it. Try my system of buying a cheap paint brush, cutting the handle so it fits in a small jar. Pour some of your primer in that jar and use that for your spot priming. The best primer for drywall, in this case, is the BIN we mentioned above.
If you have chemical sensitivities, you should call a professional as this is hazardous work.
Bleach is the unfortunate first step. You will need a chemical respirator and/or a very well ventilated room because bleach is deadly. Make your solution about 1 part bleach to 4 parts water and apply with a sponge. Let the excess water fall down onto an old towel or cloth that will be throwing away. If the area is very black with growth, you may need a stiff bristle brush to get it loose. Let the area dry before primer is applied. A dehumidifier may be helpful here.
You proceed in the steps of how to paint a room just like any other room which I have written about.