They are a tad pricey. You can get 4 for under 12 bucks but still a bit high. I use them exclusively for product removal and not the grunt work so I keep about 12 in stock and ready to go at all times. The new site does look a lot better. They are getting there but they need to do some more work...
Check out this new addition to AG. It will not change the grey to black. I think Cee Dog did an in depth review of the product.
Solution Finish Black Plastic & Vinyl Restorer, trim restorer, black plastic restorer
You should be fine with that but I would do a small test spot to see if the pad was too aggressive and to make sure it was leaving behind some tick marks.
I usually cover a panel at a time, ie, door, or fender, half of roof, etc. I just work it in and ensure full coverage. The working time of BL is crazy and is also good as a one stepper for very light marring.
For a fairly pristine finish, I use it on the Flex 3401 with a black pad at speed 4. The Blacklight will not break down like a traditional polish. It keeps going and going. I massage into the paint for several passes and then let it set up for about 15 minutes before I wipe down.
There have been some "certification" type programs in the past but like it always goes, poor management and follow up by those that ran the programs killed it.
And lets face it, you can have all of the fancy certificates you can earn hanging on your shop walls and what will the customer do...