Originally Posted by brad1
I was just up on the roof installing a fan cover and noticed that one of my rear roof running lights has a pretty big gap between the metal of the fixture and the aluminum roof. I can see that there is a washer in there of some kind, but it's pretty exposed. I'm guessing a lot of water gets in there when it rains, and even more if it rains when we're running down the highway. (Cue Doobie Brothers song).
Is there a downside to sealing the gap with silicon sealant?
I haven't had to replace a lamp in any of those fixtures and don't know if something like a sealant would make the project more difficult, or even require the breaking of stuff (which many of my repairs seem to involve).
As a bonus, I'd like to hear how you do replace the bulbs should that become necessary.
Thx and travel down Hwy 1 from San Francisco to Santa Cruz, Monterey or points south next spring. It's f'ing gorgeous right now.
I am the process of dealing with some filiform corrosion near one of my roof running lights. My repair required that I remove the existing light to determine if the corrosion went under the light (it did not!). The light has a solid, flat 'rubber' gasket that runs the entire surface of the base of the light fixture. It looks like a white colored product such as Silkaflex was used between the roof and the gasket.
My guess is that silicon is not advisable given that it gets brittle over time and is not UV resistant. Best to pursue a durable fix.
I assume that you will be taking the light unit off the roof to determine the extent of your problem. I purchased a new light unit from High Sky RV Parts - will use the new light module and the new 'rubber gasket with the original metal base (not the plastic base unit that was sent). I plan to apply a thin spread of Silkaflex across the entire gasket surface prior to screwing down the light's base plate onto the roof. If I am not 100% satisfied with how the base plate lays on the roof, I will seal the edge with Acryl-R sealant.
FYI, on my 2016 Classic, there is no bulb to replace as the running lights are all integrated LED units. That's why I bought a replacement light unit and only use the parts that I will need.