There are several well-known hard-panel acrylic products such as EZ2CY and Costa Clear. These acrylic material panels have had success in the marine market. Almost invisible, their clarity is remarkable; again, with proper maintenance, the panels will remain clear for quite some time. They are known for not changing color, and scratches can most often be buffed out. These full enclosures tend to be hot in the tropics, with limited access to open them up and let air through. They are also known for crazing, cracking and shattering like glass as they age because they are so hard.