Does a crack in a guitar affect the sound?
Hence, when there is a crack in an acoustic guitar, this will affect the way that the sound is transmitted. So what's the impact? Well usually, cracks will result in less sustain (how long a note can be heard), and less resonance. ... Cracks still can impact the tone of an electric guitar, but it's not as big of an issue.
How do you fix cracked body?
Fill the dent, gap or crack with the body filler and hardener mix. You can use paper, tape or your hands to smooth out the filler while it is still in putty form. It is recommended that you apply several thinner layers of filler to deep dents and cracks to prevent having a porous finish.