Well if it adheres to the vinyl it would seal the floor. I've used it on wood and concrete floors and it works best on the concrete in my opinion but works on wood. But it can bond to both of those floors. It will wear off in high traffic areas especially on wood and even more so on vinyl would be my guess. Unless you plan to rip up the old vinyl. Which would make it work better.
Putting down those vinyl fake wood planks is really easy and there are plenty of YouTube videos on how to do it. The results look great too.
Unusual travel map you have for this forum.
Arctic Fox 25Y Travel Trailer
2018 RAM 2500 6.7L 4WD shortbed
Straightline dual cam hitch
400W Solar with Victron controller
Superbumper