TTEOmason108

honda? check autozone i know they have like the weather strip adhesive. if they have that then they prolly have headlight stuff or at least something similar.

Fabrik8

It's very hard to find; it's not something that is sold much on the open market because headlights aren't usually resealed. Most of the stuff that OEMs use is 2 part urethane (or other types of polymer like butyl) specifically made for that purpose and not sold in small quantities. I did a lot of research on this a few years back. There are a few two part sealants that you can get through distributors like Ellsworth that would probably work OK, or maybe some of the autobody-type 2 part seam sealers. Basically you aren't going to be able to get the same stuff the OEMs use, so you're stuck finding something roughly similar that is commercially available.

Many people use 3M strip caulk, which is just black butyl mastic, and it seems to work OK if you just need to seal a small area. Don't get it very hot though, it starts getting really soft really fast above about 150degF.. It doesn't actually harden or cure, so that may or may not work to your advantage.

Don't ever use silicone. Ever. You'll never be able to separate the headlight halves with heat again if you need to. Well, that and it doesn't adhere to plastics nearly as well as most urethane or butyl products. Not many urethanes will soften very well with low heat either, so I'd be careful there also.

Lookinaround

^ well that explains why my aftermarket glass lens lamps leak.

But I've done the same thing with my OEM plastic lens headlamps. I sealed both sets with Black silicone yet only one set leaks.

What gives?

Fabrik8

If the sealant is applied properly, it should be fine. If you put more sealant on top of leaky sealant, you'll probably still have leaks. If you really want the leaks to go away, you have to remove the old sealant and apply new sealant of a proper type. That means not RTV silicone.