How should I maintain a caravan to prevent it developing leaks

Cruiser,

The one I've heard and seen used is the "Very Bright Light Test". Brother used this method to dust seal his Jayco. In a dark shed or on a very dark night, have someone crawl around inside the van with a very bright light working their way around all the seams and joins from the interior of the van. At the same time, someone outside is following their progress and looking for light. Where they see it shining through an edge or seam, it's marked and siliconed up.

Cheers,

Mick

The safest way would be clean off anything you see on old sealers and re-seal with sikaflex. The right way is remove all the corner trims and hatches, reseal with mastic. Put it all back together and clean off excess mastic with mineral turps.

Reiner