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How Can I Fix My Cracked Walls Permanently? [Solved]

Cover the crack with either mesh joint tape or joint compound and paper tape, followed by a thin layer of joint compound, extending about 2 inches on each side of the tape. Allow to dry. Apply a second coat of joint compound, feathered approximately 6 to 7 inches on either side of the crack. Allow to dry overnight.

How to fix a crack in the wall - DIY

This is how to

Why Has Your Wall Cracked? and What Can You Do?

Roger explains why

How to fix a crack in a wall or ceiling - DIY

This is how to