I am going to replace the four large plexiglass windows on my 1989 C-30. All are faded and crazed, and sometime in its past life, one was replaced with a different color. I was going to replace with lexan, but a knowledgeable boater said I should use plexiglass because it is more resistant to UV deterioration--Comments? Also, any reccomendations on the sealant. Without any more information, I will probably use a good grade of silicone sealant. Thanks in Advance