I replaced Acrylic 1/4" 15 years ago. That was heavily crazed and yellowed. But it was still tough after decades in the sun.

I used to buy polycarbonate by the 4x8' sheet for building projects. I remember this thickness was a lot more cost-about $200 for these two hatch tops. Today, that would probably be 300?

Silly not to get another 15 years out of the material, as long as it's sound. I'm amazed at how nicely all fastening holes have held up with no cracking. And there is very little crazing(there is a little) just below the surface. This stuff, Lexan, is amazing tough material structurally and I think it is stronger than Acrylic.