Running Lights
 

Is there normally a gasket that sits between the plastic body of a running light and the exterior aluminum skin of the trailer? How is this junction normally made water tight. I've discovered a small leak and suspect that this might be the source. Thanks in advance!

Cheers!

Most do have gaskets. At least the factory applied ones. I have used several things over the years to keep water out, from clear silicone, to butyl rubber, to gasket material, to Silkaflex. Some things seemed to work better for me, such as the butyl rubber, and Silkaflex.

Thanks Terry. Where would I get butyl rubber? Does it come in sheets? Actually, I think I discovered where the water is coming from. Down where the belly pan meets the side skin (right at the rub rail) adjacent the front goucho, there seems to be a bit of separation that has been slowly letting in water for who knows how long. The damage to the plywood is pretty small (less than a foot square), so I think this small leak has been around for a while. Should I seal the leak with Silkaflex, or is there something else I should be doing? I think I will remove the front goucho and cut out the damaged plywood and replace it with new marine grade plywood, as the damaged wood is quite soft.

Typically you can buy it (butyl rubber) in a tube and apply it just as you would caulk.

You can also get butyl tape. It's the roll of stuff that you use around and under roof vents for water-proofing. It cuts with a razor knife and has a bit of adhesive quality......would make for great gaskets!