Making a wall crack bigger doesn't sound like the smartest idea, but nevertheless, it is the best way to go about repairing any plaster cracks – including repairing ceiling cracks. Score the crack to make it a little wider Drywall tape: like Duck tape from Amazonġ.
Drywall joint compound: such as Wallboard from Amazon.A drywall knife, like this putty knife set from Walmart.
