Don't know what an EPOM sealing product is, EPOM seems to be an internet ad service. Now an EDPM (ethylene propylene diene monomer) is a synthetic rubber sheet material that is commonly used for flat roofs and RVs. It's a very durable roofing material with yearly checks for caulking cracks around edges and vents.
If the roof was properly coated and sealed with self leveling caulk, it very well could have been properly repaired. Go on the roof and check joints and all piercings from skylights, vents, A/C units, etc. Dicor self-leveling caulk is a good product to use for repairs, it can be applied over old, cracked seams. Do not use silicone caulk, it fails and nothing will stick to where it's been used.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI