How to prepare a wall before painting? How to apply a smoothing coating? How to smooth a wall? The result of a painting depends mainly on the preparation of the wall. The time spent recapping holes and cracks, sanding and smoothing the wall is the longest but most important step for a successful painting.
Closing holes and cracks
Start by enlarging wall murals the holes or cracking them with a coating knife. The idea is to detach the friable parts that will hinder the good grip of the filler.
Apply the filling compound to the hole or crack and pass the knife diagonally to evacuate the superfluous. Try to get a fairly homogeneous surface without too much relief. Let dry 24 hours and pass a second coat if necessary.
Sand the wall
- Before sanding, make sure you have a plastic sheet on the floor, taped against baseboards.
- Put on a ski mask (and a mask for the nose and mouth) and sand your wall with the sanding block. Your resemblance to a waffle sprinkled with icing sugar should tell you that the sanding is complete.
- If you followed my advice, all you have to do is remove the tarpaulin to find a clean floor. Otherwise, do not use your vacuum cleaner to vacuum plaster dust (unless you have planned to buy one).
- Before proceeding to the next step, the wall (s) must be dusted. Use a brush and sweep from top to bottom. You can eventually perfect this dusting by applying a damp mop that you rinse regularly.
Apply the smoothing plaster
- Forget the smoothing wall murals plaster paste ready (for the trash). Unless I played bad luck, I constantly came across pots whose dough was too dense, long and difficult to spread (with the obligation to cut it with water).
- The smoothing powder coating has the merit of being prepared according to your needs, more or less liquid. Pour the water into your container following the instructions in the package and add the powder, mix and add water if necessary to obtain your custom-made smoothing coating
- Coat, then smooth by pressing well with your spatula to spread and not overload the wall (1 to 2 mm should suffice if the previous steps have been respected). Avoid moving your knife to places where the coating has already begun to dry. Always smooth from dry to cool. The temptation is sometimes strong to iron on a part already drying, especially to correct a small surplus but rest assured, the sanding after smoothing will eliminate this little flaw easily.