To repair drywall dents and tiny holes:
- Fill dents and tiny holes with lightweight spackle using your finger or a putty knife.
- Make sure the spackle completely fills the dent or hole and is level with the rest of the undamaged wall.
- Allow the spackle to dry for 15 to 30 minutes or the time recommended by the manufacturer.
- Once dry, use a fine-grit sandpaper to sand the area smooth.
- Brush away any debris and touch up the paint.
To repair drywall cracks:
- Widen the crack with a utility knife and brush away dust.
- Fill the widened crack with lightweight spackle using a putty knife.
- Apply a thin coat of spackle over the entire area. Smooth it with a putty knife.
- Allow the spackle to dry for 15 to 30 minutes or the time recommended by the manufacturer.
- Once dry, sand the area smooth.
- Brush away any debris and touch up the paint.
- If the crack is wider than 1/2-inch, cover it with self-adhesive fiberglass drywall tape.
- Use a putty knife to spread joint compound over the drywall tape.
- Allow the joint compound to dry thoroughly as recommended by the manufacturer, then sand it smooth.
- If needed, apply another thin layer of joint compound and sand it again when dry.
- Touch up the wall paint.
To repair popped nail heads:
- If you notice a popped nail head, the nail has come loose from the wall stud. Reattach the drywall to the wall stud using a drywall screw.
- Drive the drywall screw into the wall about 1 to 2 inches above the popped nail head. Sink the screw head just below the drywall’s surface.
- Hammer the popped nail head back into the wall with a rubber mallet, being careful not to damage more drywall.
- Cover the sunken screw and the nail head with spackle.
- Allow the spackle to dry, then sand it smooth.
- Touch up the wall paint.
(From homedepot.com)
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