Conclusion. Typically, back rolling after spraying on walls and ceilings is ideal especially for your primer. It will help in promoting better adhesion of the primer and reduce issues of raised filaments with drywall.
Drywall primer should be back rolled... That's what I've always been taught. The dust that's on the walls gets rolled into the mix... Homogenizes... Then pole sand the primer Mid coat can be spray only and final coat spray and back roll. Aside from that, I generally spray anything fine finish.
I would also recommend back rolling after spraying the primer. When you spray drywall, the dust and hairs raise up in the paint. Spraying primer over dusty drywall without back rolling doesn't create good adhesion either. That new drywall might look okay, but there is a lot more dust on it than what meets the eye.
When a home is being built you will see professional painters using a paint sprayer. Most of the time this is because there is very little to mask off because there's no furniture and typically no flooring in the space. But in addition to spraying professional painters will also back roll.
You should backroll both primer and finish coats. If you leave lines in the primer coat, backrolling the finish doesnt achieve much.
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the new paint and the wall, and also to cover up any previous colors, especially if they are red, orange, or a strange outdated color.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.
If you don't backroll after a spray application, the paint will not properly adhere to the surface, which can lead to failure issues like chipping and peeling. You may also notice issues like drips and sags.
Paint sprayers generally consume 30% more paint than traditional brushing or rolling methods, with some of that paint being lost to over-spray or remaining in the hose.
Why don't painters use sprayers? Sprayers require significant prep work to protect non-painted areas from overspray. They also need thorough cleaning post-use. Some painters prefer the simplicity of traditional methods like brushes or rollers.
However, in general, spray painting tends to use more paint compared to rolling.
Here are some examples of how a primer should be used on different surfaces, depending on condition: One Coat—New drywall, raw wood, subtle color changes. Two Coats—Damaged drywall, stained walls, rusty metal. Three Coats or More—Wood paneling, bold color changes.
Customers say the Kilz PVA primer is an effective and affordable solution for priming new drywall, often providing excellent coverage with just one coat. Many users appreciate its smooth application and quick drying time, which allows for efficient project completion.
Here are some of the best primers for new drywall: PVA primer: PVA (polyvinyl acrylic) primer is a water-based primer that is specifically designed for use on new drywall. It is easy to apply, dries quickly, and helps to seal the surface, making it less porous and more receptive to paint.
Many painters “break in” a roller cover by priming it with water or thinner. In our lab we never prewet a cover before painting. If you choose to, you must spin it out with five or six strong pumps so it is only lightly damp. Then take even more moisture out by blotting the cover with a paper towel.
Dry to the touch: 30 minutes to 1 hour. Paint application: Wait at least 1-2 hours for best results.
Professional painters utilize both methods, choosing between sprayers and rollers based on the job's requirements, surface type, and desired finish.
Lack of pressure control is the single biggest limitation in the use of these sprayers. Lack of pressure control can lead to variable flow rates (dosages) of chemical preparations, inconsistent spray pattern and spray droplet size, all of which affects spray coverage and chemical performance.
Smoother Finish: While the sprayer provides a uniform coat, brushing eliminates any potential drips or unevenness, ensuring a smooth finish.
One gallon of paint will cover about 150 to 200 square feet of wall. It's best to estimate high when spraying on paint. Spraying uses more paint because the sprayer atomizes the paint into tiny droplets. Most of the droplets end up on the surface, but many others drift away.
Practice with the paint sprayer before the project to get comfortable with how it works, especially if you're a novice at using one. Fill the sprayer's reservoir with paint and spray a large scrap of cardboard propped up on a wall. Scraps of drywall also work fine to practice on.
Peeling normally occurs when the primer, basecoat or topcoat is applied and has not adhered properly. One or more layers of paint separate from one another and start to peel away. A common cause of peeling is when the surface has not been appropriately prepared.
Why? The roller imparts a uniform but soft texture onto the freshly sprayed surface.
Allow the first coat to set for 3 to 5 minutes, then add the first coat of color. Wait an additional 3 to 5 minutes, then spray a second light coat. If any additional coats are needed for full coverage, wait 48 hours after the initial painting to apply more.