Painting plaster walls is a great way to add drama and interest to a room. Plaster walls, like most walls, are flat and dull, and paint can transform them into something worth looking at. And while painting new plaster does require some preparation, painting new plaster on existing walls doesn’t take much more time than painting walls without the new plaster.
This article will discuss how best to paint new plaster and prepare your wall for painting, so your project goes smoothly and looks great!
How to prepare for painting the new plaster?
To paint new plaster, the surface must be free from all dirt and grease. Scrape it off with a sharp tool; if necessary, wash it off with soap and water. If the surfacing is old and rough, smooth it with sandpaper or a file.
The most important thing is that the surface must be absolutely dry. For this reason, never paint new plaster when rain or dampness is imminent; wait until it has thoroughly dried.
Repaint any cracks in the surface caused by settling the house; cover them with strips of cloth dipped in plaster.
How to determine the paint job for different surfaces?
If you are painting new plaster on an outside wall, make sure that it is well protected against the rain by covering every part with sheets of canvas supported by laths nailed to the wall.
When you are sure that the surface is ready, give it two thin coats of oil-based paint. If you are using oil-based paint, each coat should dry for at least 24 hours before applying another coat.
If you have to paint new plaster, it’s a good idea to prime it. But if you have to prime it, how do you paint it? If you paint over the plaster before it dries completely, the moisture from the plaster can seep into the new paint.
This is a case where even a little moisture can cause significant problems because oil paint and water don’t mix. And the water-based paints that most people use these days are mostly made of latex, which is soluble in oil paint.
So if you apply oil paint over latex, the water in the latex will seep into the oil and dissolve it, turning your fresh white walls into a sticky mess.
What are the essential steps to the preparation process?
There are two parts to preparing a surface for paint: sanding and priming. Sanding is there to smooth out any bumps and remove any scratches.
Primer is there to provide a good surface for the paint to stick to and seal the plaster from moisture, which would cause it to crack.
Unfortunately, sanding makes the surface rough again. When you prime, you are trying to make it smooth. So you have to sand between coats of primer, which makes the surface rough.
Once you start painting on top of this mess you can’t let it dry completely before painting another coat or else it will wrinkle up like an old piece of bread. You also can’t let it get too wet, or the paint won’t stick. So how do you manage?
The short answer is that you have to be careful.
Wrapping Up
If you need to know how to paint new plaster on an existing wall, it’s essential to prepare the wall properly before you start.
The painting process over old plaster is similar to what we do when we paint over drywall in homes, but some fundamental differences will help your project turn out better. And, of course, you’ll want to do a little prep work for the upcoming job.
