Small Imperfections

• 1). Wipe down the wall, using a tack cloth or damp, clean rag to remove any dust and dirt. A tack cloth is a type of sticky material, often used in woodworking, that clears debris off surfaces.
  
  
• 2). Smear premixed joint compound or Spackle over the imperfection, using a 6-inch putty knife. Add more joint compound than the indentation needs, because you will be smoothing it over an area larger than the size of the imperfection. Allow the compound to dry for several minutes.
  
  
• 3). Sand down the joint compound with fine sandpaper until the surface is smooth, and then repeat Step 2 by applying a second coat. After the second coat dries, sand it down with fine sandpaper until it's smooth to the touch.
  
  
• 4). Wipe the wall again with the tack cloth or damp cloth to remove any dried joint compound dust or Spackle.
  
  

Gaps

• 1). Fill any gaps where two surfaces meet, such as the space between your wall and the trim, with a silicone latex caulk.
  
  
• 2). Wipe away the excess caulk with a clean, damp sponge, or sand off excess caulk if your walls are smooth.
  
  
• 3). Wipe off the dried caulk and dust with a tack cloth or a clean, damp sponge.