Outer Limits 4x4 Board

Has anyone used of the windscreen repair kits, eg UFixit or Permatex's variant?

Are they useful or does it just create a mess?

Which one is better - UFixit or Permatex?

Thanks,

i used u fix it, and it said in the instructions to push the crack open to let the epoxy in. so i did and the crack tripled in size. cracked the shits, punched the windscreen, brand new windscreen. im now going to anger management. probs not much help!!!!