Flows very well to fill gaps and waterproof things. Dealership, just not sealed in the same way as the ones originally on the car. A few minutes of application, 30 minutes of curing and the lamp assembly is ready for installation. I've never had a leak since I started using it. I applied it along the entire seam where the lens and lamp body meet to prevent water leaks. I am careful not to plug any openings intended to vent moisture and/or heat. About half the time I can see where this material has found a gap and is flowing into it to fill it.
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