If you want to seal your headlights...
On the HIDPlanet forum, someone found that 3M makes a butyl rubber sealant that is the same as the Nissan sealant, but for half the price and you get 15 feet of it instead of 2 feet. Another bonus is that you can find it at Advanced Auto Parts or Parts America for $13.88. You should be able to find it directly in the stores or you can order it online from Parts America / Advanced Auto Parts website.
It can be re-heated in case you need to open the headlights again.
3M makes different sizes, but Advanced / Parts America only sells one size (3M Windo-Weld 08612)
Product Description: 3M Windo-Weld Sealant
Parts America Link
On the HIDPlanet forum, someone found that 3M makes a butyl rubber sealant that is the same as the Nissan sealant, but for half the price and you get 15 feet of it instead of 2 feet. Another bonus is that you can find it at Advanced Auto Parts or Parts America for $13.88. You should be able to find it directly in the stores or you can order it online from Parts America / Advanced Auto Parts website.
It can be re-heated in case you need to open the headlights again.
3M makes different sizes, but Advanced / Parts America only sells one size (3M Windo-Weld 08612)
Product Description: 3M Windo-Weld Sealant
Parts America Link