3M Marine sealant works much better. It will seal anythnig that sits under water for years!! Hell, even Walmart used to sell it. Use it sparingly to tack down the lights and a little on each screw and your in business.
Anyone that bashes someone for thinking "out of the box" is not a true hot rodder. Do what you like and if it is cool, many will follow.
Rubie.
2006 GMC Sierra 1500 HD Crew Cab 4X4, 6.0L, 12" CST lift, 37" tires, CAI. Vinci cam 210*/218* LIFT .587 / .595 LSA 114*4A, Power Slot rotors all around with ceramic pads, Rebuilt 4L80E with shift kit and billet converter.
Rubie