Ted Carbonaro Posted March 12, 2022 Share Posted March 12, 2022 What is the recommended sealant to use to finish sealing the skylight to roof? Skylight has been replaced by others, but now needs the top coat of sealant to complete job. Thanks Link to comment Share on other sites More sharing options...
Wrayj1 Posted March 12, 2022 Share Posted March 12, 2022 Ted, my skylight was last sealed with Dicor sealant, however, last summer I purchased 50 ft of 6" wide eternabond tape and used that to seal all the roof seams and roof penetrations that require it. I have used Eternabond for years and it lasts several years, very good product. It does require a good roof cleaning and then clean the areas to be seal with isopropyl alcohol or any other appropriate cleaner before applying the eternabond. The Eternabond needs to be rolled after installing it, I used a 2" wide steel roller. I don't expect to ever seal again during my ownership. 3 Link to comment Share on other sites More sharing options...
Mark Holt Posted March 12, 2022 Share Posted March 12, 2022 Dicor self leveling sealant 1 Link to comment Share on other sites More sharing options...
vito.a Posted March 12, 2022 Share Posted March 12, 2022 (edited) Polycarbonate skylights should be sealed with non-petroleum-based sealant. They recommend SB140. Amazon.com: SUREBOND BriRus SB140 Skylight Sealant (SB-140 T White) : Industrial & Scientific Any petroleum based sealant will cause hairline cracks. Edited March 12, 2022 by vito.a Link to comment Share on other sites More sharing options...
96 EVO Posted March 12, 2022 Share Posted March 12, 2022 1 hour ago, vito.a said: Polycarbonate skylights should be sealed with non-petroleum-based sealant. They recommend SB140. Amazon.com: SUREBOND BriRus SB140 Skylight Sealant (SB-140 T White) : Industrial & Scientific Any petroleum based sealant will cause hairline cracks. +1 When I replaced my outer dome I used a heavy bead of Surebond SB140 under the flange, screwed it down just enough to see the sealant spreading, then a strip of Eternabond over top. 1 Link to comment Share on other sites More sharing options...
Ted Carbonaro Posted March 12, 2022 Author Share Posted March 12, 2022 Thanks All! Link to comment Share on other sites More sharing options...
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