- Go to Lowes.
- Get a small bucket of joint compound, mesh joint tape, and some putty knives.
- Score the crack so you will be able to get some joint compound in it.
- Dampen the area around the crack.
- Spread a light coating of joint compound over the area.
- Spread the mesh joint tape over the crack and press in with a putty knife.
- Spread a light coat of joint compound over this.
- Let dry.
- Sand lightly.
- Spread additional coats, letting dry and sanding between each until it ls smooth.
- Repaint.
The folks at Lowes are very helpful. No, I don't work at Lowes and don't have stock in the company.