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Neither EDPM nor TPO roofs need to be sealed and don't benefit from it.
EDPM is notoriously sensitive to solvents of any kind, and the only reason for washing it is to remove the dirt and loose binder material that makes the black streaks down the RV sides. EDPM is UV stable and needs no additional coatings for that either.
TPO was introduced in the mid 90's and doesn't even shed binder material like EDPM so the only reason for washing it is pride.