Need help with a headlight lens issue

[robkay]

2007 hatchback. I had to pull my headlight lens off to fix something. I didn't do the heat-in-oven thing, I just kept pulling on the lens and cutting the sealant with a utility knife until I could get the lens off.

I've never seen that gray sealant before and it's kind of balled up in spots. Can anyone tell me what that sealant is so I can get some to reseal the lens when I put it back on?

I'm not sure silicone will work because of the housing being polypropylene. You probably have to use a sealant that will stick to it.

Thanks in advance!