Again, I take no credit for anything. Beautiful work by skilled artisans doing what they do. I just tell the story.
The bib looks like it belongs on a DQ menu in the tasty treat section…🍦
And by properly I assume you are meaning they have their own sealant to use. It needs to have sealant. You can use polyurethane roofing sealant. Toyota recommends sikaflex 256HV
https://forum.ih8mud.com/attachments/inst-pdf.390538/