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Old 07-04-2013, 09:40 AM   #1
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How to seal a leak

Thanks for this forum, although I'm a little older then most, I continue to learn through your posts.
I've have a leak in the front of my trailer, and after searching your post, it was recommended to check around the running lights. I checked my upper marker lights and sure enough it was never sealed with caulking. My question- do I go all around the marker light with caulking, or leave an small opening on the bottom to let any water that might get in leak out?

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Old 07-04-2013, 10:30 AM   #2
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Just putting a bead of calk around the light is only a temporary fix. In order to seal them correctly you need to remove each light, clean the area and the lights thoroughly, then seat them in a bed of butyl rubber or better yet use Eternabond double stick tape. After re mounting you can then put a small bead of butyl around the fixture. Do not calk the covers to the fixtures. No need to leave a path for the water to escape if you don't let any in.

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Old 07-04-2013, 10:37 AM   #3
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I would remove the lights, apply sealing putty behind them, screw back down, then silicone around the top and edges, but leave a spot at the bottom for water, like you said.
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Old 07-04-2013, 03:39 PM   #4
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leaving an opening at the bottom of clearance light could cause water to driven up and into if travelling in rain.
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Old 07-04-2013, 07:15 PM   #5
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There is no need to seal around the outside of running lights if you seal the wiring access hole in the trailer and the mounting screw holes.
When I discovered my running lights accumulated water inside the lens, which then followed the wiring inside the trailer, I drilled a 1/8"hole in the bottom of each lens to prevent future occurrences.
DO NOT USE SILICONE, IMO silicone is not a good sealant for RV's. Dicor non-sag sealant is the best option for this application. When removed silicone leaves a stubborn film that nothing else (not even new silicone) will adhere to, requiring the use of a special silicone removal product.
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leak, seal

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