Many years ago i had an untraceable leak in a static caravan eventually i applied water to the roof containing drain tracing dye.
Static caravan roof vent leaking.
I applied different colours of dye to small areas at a time eventually i narrowed down the leak source colour of dye emanating within the caravan.
The most common way of finding a leak is to wet the caravan roof and watch for the points the water is seeping through.
It was leaking through the join of the handles so i fix it using a foolproof method buy the mastic that i used h.
Unfortunately the rubber boot damage often becomes the main cause of roof vent leaking.
Some leaks can be hard to track to their source but one i recently found was a pretty straightforward job.
Replacing the entire roof is never a small job.
Most caravan leaks occur at a join or attachment hole where a screw or rivet holds down the sheeting to the frame.
Doing a quick repair on my caravan skylight.
If your caravan roof only has minor leaks and you have been able to identify where they are it might be worth rethinking whether you need to replace the whole roof or resealing the roof would be an option.