Step 4: Sanding and Primer (if applicable)
Sometimes the wall surface is not very smooth, so you need to sand it before paint is applied.
* For plaster and patched areas, you should sand it smooth with a medium then a fine grade sandpaper. After that, you should use a prepcoat or undercoat such as Dulux Prepcoat Acrylic Sealer Undercoat to prepare the surface for the top coat.
* For new woodwork , you should sand it with a medium grade sandpaper in the direction of the grain and then prime the surface with primer or prepcoat such as Dulux Prepcoat Acrylic Primer/Undercoat or Dulux Prepcoat Oil Based Undercoat to prevent tannin staining and provide excellent adhesion.
* For previously painted surfaces, especially gloss and semi gloss surfaces, you need to sand it thoroughly to roughen the surface and then use the primer. The higher the contrast the more likely that it is that you will need a primer. Primer also helps seal the wall and creates a smooth, nonporous surface ready for the top coat.

Step 5: A final clean and check
Before painting give your work a final clean and check. Wipe the walls thoroughly with a damp cloth and the woodwork in a cloth soaked in methylated spirits, to remove any remaining grime or dust.
Step 6: Masking
This is one of the most important steps for How to paint a wall. In order to get a clean line between the wall and the baseboards, light switches and anything else you don't want to accidentally paint, is to mask them off with tape. Although this step is often seen as unduly time-consuming, skipping it will result in an unprofessional finish.
Please make sure you buy the right masking tape. At DIY stores or other painter shops, ask the shop assistant for "painter's tape" or " Masking tape". Press down against the tape with your finger or a putty knife to seal it against the surface. This will prevent paint from seeping behind the tape.

That's How to paint a wall and you are now ready to paint.


