Rubber Weather stripping around the doors...

[Spartacus]

I'm a diehard 303 user. Works great as a preservative. Never had to use it to salvage very poor seals, so I can't say how it does there. The seals on my '87 Mercedes 300SDL had begun to fade and be a bit dry, and 303 did great after a couple of applications. Then they looked nearly new.:clap:

 

[imported_gewb]

Meguiar's Vinyl / Rubber Protectant

Regards,
GEWB

 

[f55c6]

Believe it or not

GM recommends using dielectric silicone grease on weatherstrip GM #12345579. I've done this on my 98 SS from day one and the weatherstrip is still like new almost twelve years later.

 

[imported_Woodie]

I use Meguiars M40, Aerospace 303 or Sonax Gummi Pflege depending on which product reacts best with the rubber seal on the vehicle concerned.

 

[bmw5541]

I use Black Again. Just be sure to buff off the excess as it will run if you do not.