A gallon of primer will cover between 250- to 400-square feet of surface. Two coats may be needed over heavy stains or tannin-rich wood. Most primers can be tinted to help ensure good coverage for the finish coat. Bright or deep colors require a tinted primer.
Depending on how strong or bold the previous color is, it may be necessary to apply more than one coat of primer. However, it is not necessary to over apply the primer with so many coats. As long as the primer applies uniformly over the previous color, then one or two coats should be sufficient.
You will want to use 2-3 coats of primer to ensure there is a good bond between the new paint and the wall, and also to cover up any previous colors, especially if they are red, orange, or a strange outdated color. In short, you will typically need 2 coats of primer for most painting projects.
One gallon of Primer will cover approximately 225-275 square feet.
How much paint is needed for a 12'x12' room? You'd need about 1.5 gallons of paint to cover a 12'x12' room with 8-foot-high walls.
How much paint is needed for a 10×10 room:- using thumb rule, for fresh painting a 10×10 room represented as 10 by 10 feet or 100 square feet room, generally, there are 1.38 gallons or 5.2 Litres of paint is needed for a 10×10 room to cover ceiling and wall and for re-painting of 10×10 room, 0.80 gallons or 3.13 litres ...
One quart will cover 100 square feet. Because you need to cover 328 square feet in this example, one gallon will be adequate to give one coat of paint to the walls. (Coverage will be affected by the porosity and texture of the surface. In addition, bright colors may require a minimum of two coats.)
Always prime your walls before painting if the surface is porous. The surface is porous when it absorbs water, moisture, oil, odors or stains. For example, brand new drywall is a very porous material.
Primer Drying Time
Most latex primers dry to the touch within 30 minutes to 1 hour. But do not paint the wall until the primer dries thoroughly, which can take up to 3 hours. High humidity and cool temperatures prolongs drying times.
The primer coat doesn't have to be perfect, but it should cover the surface (no bare spots) and it shouldn't be so blotchy that you get drips or visible unevenness.
Sanding after applying primer should help keep your surface as smooth and flat as possible, eliminating brush marks, or extra little globs. Also when painting, like others have pointed out, can raise little fibers from the drywall, going over the surface with a sheet of sandpaper can help get rid of those lose fibers.
Primer shall be able to be applied satisfactory at 2 to 3 mils dry-film thickness in one coat. Type 2: Alkyd enamel (gloss) — Alkyd based enamel shall be lead free. It shall have a minimum of 49 percent solids, by volume.
One gallon can of paint will cover up to 400 square feet, which is enough to cover a small room like a bathroom. Two gallon cans of paint cover up to 800 square feet, which is enough to cover an average size room. This is the most common amount needed, especially when considering second coat coverage.
You're painting unfinished drywall or plaster.
Two primer coats are recommended in this scenario because much of the first primer coat will be soaked up by the wall; the second coat will replenish any primer absorbed by the surface and hide any flaws in the wall.
For the larger spaces of the wall, apply primer using a 9-inch paint roller with a 3/8- to 1/2-inch high quality roller cover. Fit the moistened roller cover onto your paint roller. Stir and pour the mixed primer into a paint tray. Dip the roller into the primer, making sure it's completely covered.
Applying primer first is the best way to ensure a perfect finish later. Just as it does with makeup and on cars, primer creates a smooth base that promotes better adhesion and truer color from your topcoat paint. Pro-tip: Apply primer using a brush first to “cut in" around edges, then use a roller to fill in.
It should not have streaks, drip lines, or large variations in coverage. An uneven or streaky coat of primer may result in an uneven paint job. Primer should have an even, uniform appearance. There should not be streaks, drips, or uneven coloration to your primer coat.
Primer Preparation & Application:
Slowly add about 1 volume of clean water to the 1 volume of Wallplus water Primer and mix it thoroughly. Prepare the primer as per the requirement, so that the thinned primer can be used on the same day after preparation.
The amount of paint needed for a wall is much easier to calculate, since we can simply measure height by length to get the square footage. For example, one can of 30-oz paint should cover a wall that measure 10 feet x 10 feet.
Generally, you will want a minimum of two coats of paint – this is a good rule of thumb for any wall or ceiling you're painting. You'll rarely get a seamless finish from just one coat of paint, and even if you do, coverage isn't the only goal when it comes to painting a room.
The average bedroom, according to the National Home Builder Association, is about 432 square feet. For the average painter and a room this size, the whole job should take about 4-6 hours from preparation to cleanup.
The ceiling should always be painted first. This allows you to effectively cover the surface with at least two coats while not having to worry about any over-spray (the effect of excess paint being sprayed onto the walls) by the roller.