: Use a small drill bit (1/16" to 1/8") to drill a hole at each end of the crack. This "relief hole" converts the sharp crack tip into a rounded notch, which stops the stress from propagating further. Phase 2: Choosing the Right Adhesive
Not all cracks are fixable.
: If the crack goes all the way through, place clear packing tape on the back side to prevent the adhesive from leaking out. YouTube +2 3. Apply Adhesive Standard household glues often fail on Plexiglass. Use specialized acrylic cements that "solvent weld" the plastic back together. YouTube 11 sites Repairing a Crack in Plexiglass Mar 18, 2009 — how to fix a crack in plexiglass