There is a lot more to know about magnetic paint than you can just paint it on your walls and magnets will stick. First, there are different brands of magnetic paint. Some are pre-mixed with primer paint, are quite expensive and can be difficult to stir up to a usable consistency. They go on black or a very dark gray color so they can be hard to cover with light colored finish paints. I invented a dry magnetic paint additive that mixes with white primer. It mixes up easily in seconds and is fresh every time you use it. It goes on white and stays white on your wall. Because it stays white, it covers easily with one coat of any color finish paint. Two coats of any brand magnetic paint are required to get magnets to stick. Many people prefer three or even four coats for maximum magnetic attraction. Personally, I would never use the spray cans of magnetic paint. They can go on too thin to be of much use.
Not all magnets will stick well to magnetic paint on a wall. Cheap magnets, weak magnets and heavy magnets may actually fall right off. I had some plastic letters once that were made in China. They had small plastic magnets in the center of each letter. They were so weak that they would not even stick to the steel door on my fridge. They didn't have a chance of sticking to magnetic paint.
Magnetic paint only attracts magnets because it has millions of microscopic metal particles in the paint. It is these particles that attract magnets, not the paint. The paint only holds the particles on the wall. The more coats of the magnetic paint you get on the wall, the stronger the magnetic attraction of the wall. That is, unless you didn't get the magnetic paint mixed up well enough or didn't keep it mixed up well enough while doing the painting. In the pre-mixed brand, because the metal particles are heavier than the paint, they can settle to a thick, heavy layer on the bottom of the can and sit there for months on the store shelf. When you have the paint store man mix it on his mechanical mixer, it may not mix. The metal particles can stick to the bottom of the can in this thickly packed mud. You may need to chip and scrape it off the can's bottom with a screwdriver and beat it into submission with a paint stick or an electric drill mixer. My Magically Magnetic Paint Additive mixes up instantly and easily in seconds everytime you use it, with just a few seconds of stirring with a simple wooden paint stick. Always remember to stir your magnetic paint again just before adding more magnetic paint to your paint roller tray.
If you want a strong magnetically attractive area to stick the magnets to, magnets like you may already have on your refrigerator door, get a steel panel and adhere it to your wall. Nothing attracts magnets like solid steel. But if you want to have a beautiful magnetic wall to display photos, the kid's art or a million other things magnetically, magnetic paint will do the trick beautifully. You just need to know what you can and can't expect from the materials.
Magnetic paint is made to attract sheet magnets and rare earth magnets. Sheet magnets are the kind of magnets used to make magnetic business cards and magnetic signs for car doors. They stick well because they also have millions of tiny metal particles in them that have been magnetized. Their strength is weak compared to a strong rare earth magnet but they are much larger and very light so they stick well to magnetic paint. Sheet magnet comes in 15 mil, 20 mil, 30 mil and 60 mil thick. The thicker the magnet, the stronger the magnetic attraction. Rare Earth magnets are extremely strong and lightweight. They can actually jump and stick together instantly if they are held close enough and can chip or crack if they smack together hard enough. To avoid this danger, I have designed my Safety Cap rare earth magnets. They all have the same magnetic north pole showing at the bottom and can't jump and smack together face to face. Their magnetic power is used to stick to steel or your magnetic wall.
In summary, mix the magnetic paint well before you paint. Before every coat, mix it up again to keep the metallic particles in suspension in the paint. Particles left in the paint can or in the paint tray don't do your wall any good. Use a 1/4-inch closed-cell foam paint roller to apply the magnetic paint. A regular fiber roller can allow the particles to get trapped in the spaces between the fibers. Again, what gets caught in the roller doesn't end up on the wall. A foam roller is closed cell meaning there is nowhere for particles to get caught. It will produce the smoothest magnetic wall. All magnetic paint will have a slight texture since the magnetic particles don't dissolve in the paint. When the paint dries, the particles will show as a light texture. Tape around the area you want magnetically attractive and paint the magnetic paint inside this taped off area. That will produce a nice clean straight edge around the outside of the magnetic area. When the magnetic paint is dry and you are happy with the attraction to your magnets, remove the tape and finish with a coat of your choice of any color finish paint on the entire wall. This will make a nice looking finished job and the light texture of the magnetic material will be less noticeable. The finish coat of paint also helps to protect the magnetic particles.
If you want to make a magnetic chalkboard wall, don't use a mixture of magnetic paint and chalkboard paint. Paint the magnetic paint first and when it is dry, sand it lightly with 000 sandpaper to get rid of any unwanted high tips of excess texture. You aren't trying to make the wall completely smooth. Then paint two coats of the chalkboard paint as your finish coat.
Magnetic paint is a wonderful product and works very well if you know how to use it. I hope I have added to your knowledge on the subject.
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