How Do I Make A Fiberglass Bumper?

[Silentalero]

side note, i did glass my back seats, i just had my friend help me with materials from his shop. And if your gonna mold off a astock bumper you can but you need to cover the entire bumper over in fiberglass so it takes a hard shape. The only reason it would crack is if the urithane flexed and it stressed the fiberglass. Thats why im covering the entire bumper in fiberglass to make the mold, but if you do that make sure you do it while its on the car so it fits right.