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There is an acrylic DIY product called 'Never Caulk' sold by Rv Roofing Solutions. https://www.rvroofingsolutions.com It's an easy process thats very user friendly. You brush down the liquid acrylic, apply a layer of polyester fabric, and coat again. It's a permanent roof seam sealant. If needed, tech support is free and available over the phone or email.