I have never seen proof on this all I have heard is people saying it to justify you spending money on cast. I have asked a few shops here and they say crazing and failure is from bad glue and prep and nothing to do with cell or extruded.big t said:Hey Don.
It has been proven plenty of times that extruded plastic does not hold up over time. This is why every single aquarium manufacture uses cell cast. When you add water to a tank it causes the plastic to swell w/ water by a very small amount. This happens more so w/ extruded and causes extra stress on the joints causing them to craze and eventually let go.
Talk to ya later