It's winter in the snowbelt but for you lucky guys in the south, here is how to confirm what you have for roof material.
RV 101® – How to Determine RV Roof Types | The #1 RV Video Education training Source RV 101®
TPO Thermoplastic Polyolefin or
EPDM ethylene propylene diene monomer rubber
TPO is newer style but I don't know what the advantage is. We assume newer is better but that may not be the case for RV roofing.
I would think Dicor brand would have a roof sealer product in cream color but who knows.