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If they are installed correctly, they will not leak and Not need silicone
I agree with you, however I still recommend it as a preventive measure. Plus we are talking about aftermarket parts here, and they don't always fit like OEM parts do.
Wow - I never thought a silicone vs O-ring fight would break out in this thread!! While not on the level of the V-8 vs Straight 6 legendary brawls I've seen on other threads, I could see that coming! I don't have a dog in this fight, but it's been my experience that o-rings and rubber gaskets will leak or breakdown over time - especially in hot/dry conditions. However, silicone can be somewhat messy and most over-apply it. On an application like this, I would use both. I think having silicone on the O-rings/gaskets will lengthen their efficiency, and provide a bit more of a seal if needed. If/when they leak in 10-15 years, I'll replace them.
I never thought we'd be in an argument over this either. Seems kinda sad and funny at the same time. I wasn't saying to use silicone to glue the lights on or gob it on to where it looks nasty. All I was saying is to use a little bit around the wires where they come through the cab and on the threads of the screws as an extra means of securing that the lights won't leak after they are installed because it seemed that the intallers were worried they would.
Silicon / RTV has is uses, but not for sealing a gasketed light. When a bulb goes out(which they do) then you will be PRYING the light off the roof. A gasketed light will come right off.
I have been installing cab lights for over 20 years(I venture to say 20+ sets) and still have the 1st truck I installed then on. NO LEAKS and they have been off a couple times to replace bulbs.
Now for silicone on Visor screws, YES. Cab lights, NO
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