For those of us with TPO roofs, this is what I found on Dicor's web page"
"While Dicor Lap Sealant can be used without concern on all EPDM (rubber)
RV roofing, if your RV has TPO roofing and it was built after 2010,
you may need to use the Dicor Ultra Sealant System instead to avoid
disfiguration and bloating of the roofing that may result from using
Lap Sealant."
Webpage address: https://cdn-tp1.mozu.com/17063-m1/cms/files/3c73c141-bf3d-4762-b5f9-45af9a22e93f
FYI