How to properly prepare a wall for painting

Essential Supplies

Before you begin, make sure you have all the necessary supplies.

These typically include:

• Drop cloths or plastic sheeting
• Painter's tape (Masking Tape)
• Sandpaper (various grades)
• Filling compound or putty
• Putty knife
• TSP (Trisodium Phosphate), Sugar Soap or mild detergent
• Sponges or clean rags
• Ladder
• Primer (if needed)

Clear the Area

• Remove all furniture from the room, or move it to the centre and cover it with drop sheets.
• Take down any pictures, curtains, and hardware from the walls.
• Cover the floor with drop cloths or plastic sheeting to protect it from paint drips.

Surface Cleaning

• Dust the walls with a duster or a dry cloth.
• Wash the walls with a solution of TSP, Sugar Soap or mild detergent and water. This step is crucial for removing grease, dust, and other residues that could prevent the paint from adhering properly.
• Rinse the walls with clean water and let them dry completely.

Repair and Sanding

• Inspect the walls for any holes, cracks, or imperfections.
• Fill in small holes and cracks with filling compound using a putty knife. For larger repairs, you may need a different type of filler or patch.
• Once the filler is dry, sand the area smooth with sandpaper. Start with a coarser grit and finish with a finer grit for a smooth surface.
• Wipe down the walls again to remove any dust from sanding.

Tape Off Areas

• Apply masking tape to the edges of the wall, along trim, windows, and door frames.
• Make sure the tape is well-adhered to prevent paint from bleeding underneath.

Apply Primer (If Needed)

• If you’re painting over a darker colour, painting new render, or if there are stains on the walls, applying a primer is recommended.
• Use a brush or roller to apply the primer, starting from the top of the wall and working your way down.
• Allow the primer to dry completely according to the manufacturer’s instructions.

Final Preparations

• Check the walls one last time for any missed spots or imperfections.
• Ensure that the room is well-ventilated.
• Have all your painting supplies (paint, brushes, rollers, etc.) ready.

By following these steps, you'll create a clean, smooth surface that's ready for painting.

Proper preparation is key to achieving a finish that looks professional and lasts longer.