yikes! all very confusing!
According to Dicor's website (
https://dicorproducts.com/product/ep...ealants/#specs)
they make three versions of EPDM lap sealant (which this page seems to imply, are
all compatible with both EPDM and TPO), and described as follows:
501 - Self-Leveling (for horizontal surfaces)
505 - HAPS FREE Self-Leveling (no Hazardous Air Polluting Solvents)
551 - Non-Sag (for vertical surfaces)
I agree with the suggestion to contact their customer service and discuss it, info on that page
could be incorrect or misleading!