What I'm looking for is something that can be used as a miniature gutter to direct water from the edge of an object towards somewhere more appropriate for it to end up.
A simple round bottomed 'j' section that's about 25mm wide across the bottom and at least 30mm high would be perfect. The length needs to be about 3 metres. It needs to be weatherproof, so white plastic or extruded aluminium would seem like promising materials.
I had hoped that the local DIY sheds might have had something, I also tried a specialist in PVC cladding materials.
Does anybody have a suggestion where such a profile can be readily obtained ?