I've had a look at the top of the van now it's on the drive and I have access to steps.
There is black sealant of some type along the rail. This beads the water and stops it for large sections of it.
Then there are sections were is looks like it's come away or 'collapse' slightly. This causes the run through. Tested by pouring some water onto the pop top at various points and watching make it's way down.
There is black sealant of some type along the rail. This beads the water and stops it for large sections of it.
Then there are sections were is looks like it's come away or 'collapse' slightly. This causes the run through. Tested by pouring some water onto the pop top at various points and watching make it's way down.