- How do you fix a cracked glass at home?STEP 1: Clean the glass with dish soap. … STEP 2: Mix up the two-part epoxy. … STEP 3: Apply the epoxy to the crack in the glass using a putty knife. … STEP 4: Remove excess epoxy with a razor blade and let the rest cure. … STEP 5: Spiff up the surface with a glass cleaner.