Best way to seal new TYC Headlights/DRLs?

Amp Wrangler · Mar 18, 2026

Hi GMT800 Family,

I picked up a new set of CAPA-certified TYC headlight and DRL assemblies this week for ye ole 99. I want to take the right preventative measures now to make sure the condensation gremlin doesn't return.

I'm planning to run a thin bead of clear silicone around the housing seams and replace the lamp gaskets, but I wanted to see if the community had a better approach or a specific sealant recommendation?

Also, does anyone know if the rubber lamp seals / gaskets are available as a standalone part? If so, does anyone have a GM or aftermarket part number?

Thanks for the help!

ORVietVet · Mar 18, 2026

Yes, clear silicone or any color you want, really. The seal, don't know.

4silverado · Mar 19, 2026

Last time I did new light assemblies, I couldn’t find bulb seals. I used clear silicone around the seams.

AuroraGirl · Mar 19, 2026

Amp Wrangler said:
Hi GMT800 Family,

I picked up a new set of CAPA-certified TYC headlight and DRL assemblies this week for ye ole 99. I want to take the right preventative measures now to make sure the condensation gremlin doesn't return.

I'm planning to run a thin bead of clear silicone around the housing seams and replace the lamp gaskets, but I wanted to see if the community had a better approach or a specific sealant recommendation?

Also, does anyone know if the rubber lamp seals / gaskets are available as a standalone part? If so, does anyone have a GM or aftermarket part number?

Thanks for the help!

The seals are for dust not water. You can use dielectric grease on them to make them more spongy so they don’t resist removal and rejuvenate them a bit for use. I’d avoid the silicone around the housing unless you have a water getting in problem like when you splash a hose at the housing.