I haven't tried any competing products, but this seems to work pretty well.

Some of the uses I've tried:
- Rubberized FC spoiler
- Weather stripping around windows
- Black body trim
- Taillight housings (black) and lenses (clear & colored)

Works great.

 

nice, i have a bottle of it, still brand new..i need it use it on all the ashy lookin rubber weatherstripping on the 7

 

I've used similar stuff called Forever black before on stuff. Works great for FD chin spoiler and rear valence. Pretty much permanent fix too.

 

Don't get it on regular paint, it makes the paint look darker, and you can't wash it off...found that one out the hard way...

 

Forever Black or Mothers B2B?

 

Mothers B2B