So far I am quite pleased with my frameless windows especially since my boat interior
is no longer soaking wet! I used some 1/4 tinted plexiglass because I had some laying around. I simply traced around the outside of my old frames which were about 5/8" larger than the openings, lightly sanded the inside edge of the cut plexiglass (used a jig saw and a coarse wood blade. The finer blades would melt the plexi and it would weld back together.), applied a medium bead of Lexel brand caulk (sticky stuff), and taped the windows in place. After 24 hours or so I pealed the tape and applied another bead of Lexel around the outside edge, and wallah! Here we have pretty good temperature swings between noon and midnight and I have not noticed any problems. The real test will be the ocean of course. I will report any problems if they occur there.