Although paint may initially adhere to an unprimed wall, skipping primer risks blotchy, cracking, and peeling consequences. In general, one to two coats of primer are sufficient for painting interior walls, although the number of applications required varies on the wall material, paint color, and kind of primer used. One or two coats of paint can be used as a substitute for primer, but it will not have the same effect.
Paint is designed to stick to other things, so there's no need to apply primer if you plan to cover a previously painted surface. If, however, you're planning to add another coat of paint to an already primed wall, then primer should be applied again before the second coat. This is because primer helps the next layer of paint adhere to the wall.
The best way to determine whether primer is needed is by taking a close look at your painter's guide. It should include instructions on how much primer to use with different colors and types of paint. Follow these instructions carefully; otherwise, you might end up with a poor-quality finish that requires repeated coats of primer and paint.
You should also ask your painter about any special steps they may suggest when preparing your walls for painting. For example, some painters recommend applying filler strips along baseboards and near windows before starting work so that they don't get brushstrokes on those areas.
Use 2-3 coats of primer to provide a solid adhesion between the new paint and the wall, as well as to cover up any old colors, especially if they are red, orange, or an odd outdated hue. In short, most painting tasks will require two coats of priming. However, some people choose to use more than two coats of primer because it does increase the thickness of the final paint job.
As you can see, applying too few coats of primer could result in a poor finish, while applying too many coats could increase your expenses without adding much value. So, following is an approximate formula you can use to determine how many coats of primer you should use on your house:
For an average size home with an average color scheme, one would need about 20-30 gallons of primer to cover the walls properly. Of course, this number depends on how thick you apply each coat of primer and the type of material you use. If you choose to use fewer coats than recommended, then that's fine as long as you don't cut into your coverage area with subsequent applications.
The best way to tell how many coats of primer you need is by using a sample piece of paper and seeing how many coats it takes to cover it. Then, multiply that number by the surface area of your house to get an estimate for how much primer you need.
Follow the guideline and apply two coats of paint following the primer on a fresh wall. Apply the same criteria to drywall. If you're repainting a wall, if you use the same color and high-quality paint, you'll only need one coat. But if you choose a different color or quality then you'll need more than one coat.
The key is to use a high-quality paint. If you go over the painted surface with a fine brush or sandpaper then it's called "repainting" and requires more than one coat. However, if you only cover any unsightly marks or dirt with a coat of paint then you're done! You won't even notice those marks until they are rubbed into the paint.
After you've primed and painted your wall once you should be ready to live with it for several years to come. But if you want to make sure that it lasts longer than that then follow these steps:
1. Use a vacuum cleaner to remove any dust that may have accumulated during painting or priming. This will help keep your wall free of any blemishes that may appear over time.
2. Lightly sweep away any leftover dust before it has a chance to accumulate again. This will ensure that your paint job remains streak-free.