We'll be installing new windows which arrived yesterday from Great Lakes Aero Products. GLAP does not include sealant but offers 100% GE Silicone - RTV which of course it readily available locally. My A&P wonders if Mooney (or youse guys) have other sealant recommendations. (Silicone sets pretty fast and is not the easiest sealant to use.) FWIW, the old windows which I removed had Silicone for the 201 style windshield which was installed in 1993. I had to use a hammer and take it out in