You probably don't need a primer. If the current wall is smooth, clean and covered with the same type of paint (both are oil-based, for example), you can go straight to get the paint. You need to fill holes, putty and sand*, maybe even cut a new piece of drywall on the existing wall. You can use a primer to completely cover the old color and then apply 1 or 2 coats of new paint.
Always print walls before painting if the surface is porous. The surface is porous when it absorbs water, moisture, oil, odors or stains. For example, new drywall is a very porous material. Both the paper that covers it and the mud for drywall are compromised by water or moisture when they are not first sealed with primer.
This material will literally absorb paint directly into it if you don't print it first. While you can escape without using a primer, especially if you use a color that is only a few tones away, priming is always a good idea. Not only will it ensure that your new color is vibrant and seamless, but it will also cover any other discoloration. Using a primer is absolutely necessary if you are planning to make a dramatic color change.
I recommend using an oil-based primer for particularly discolored or defective walls. One coat of primer should do the trick, but if you're trying to cover a dark color, you might need two. To help achieve a uniform appearance with the final coat, when painting new drywall or on drywall patches, it's always a good idea to use a primer first and, in addition, using a quality drywall primer is usually much cheaper per gallon than using several coats of latex paint for interiors of quality. Fresh drywall absorbs paint like a sponge, and turbid joints take on paint differently than bare drywall between joints.
Paint manufacturers say that “yes, it's an essential wall painting technique because they want the best possible surface for the paint to shine. Oil-based paint will not adhere to the existing latex paint layer, so you need to create a kind of intermediary. This painting tips article will look at some common situations and provide simple solutions to help you paint your walls, even if they were previously painted in a dark color. If you're thinking of painting over those old wooden panels in your study or painting a set of shelves, you'll want to prime first.
That is why paint manufacturers have developed a new, faster drying technology for oil- and latex-based products that dry quickly and, at the same time, help the finishing coat of paint to adhere properly. For a more accurate color representation, view a color sample or paint color sample in the space you want to paint. The problem is that too much paint will be drawn and you will end up needing several layers of paint. Paint %26 in one primer paints are a newer option, which could be ideal for your situation and even shorten your project.
If the wall you're painting is damaged by water or is otherwise stained, you must prime before painting. Painting a light color over a dark color requires additional layers of paint to prevent the old color from being seen through the new shade.
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