We glazed our lean-to g'house with polycarb. I can't remember the exact year, but it was relatively new on the market, and my g'son was a little fellow. Well more than ten or twelve years. He's pushing eighteen now. It has weathered beautifully, so far. It was a commercial brand, don't know if all are created equal.

My corrugated polycarb is 15 years old. About 2 years ago the outside finish began to change from slick and clear to what appeared to be rough and was almost like pollen and dust stuck to it. It feels rough. I am replacing it this year. I have been well pleased with it.