I recently had a chance to detail a Lincoln Mark LT and at the base of the windshield, I got a chance to document a very important application technique for severely faded plastic trim.
This is what the truck looks like
This is the trim at the base of the windshield
After the first application of BW, you can see a noticeable improvement
Looks great so far!

But after a washing and an hour later, the BW looks faded already
Most newbies would give up and say BW is a piece of junk. However, what I always tell people is that BW needs to fully absorb and saturate the plastic and on severely oxidized trim, it needs more time to absorb. So I applied more product.
Seems to look even better now.
A total of 3 applications were made, spread over the course of the 12 hour detail.
So as a final test, I applied BW over the untreated adjacent area, and despite putting on multiple coats in a hurry, in an hours time, the area that wasn't allowed to soak is visibly lighter than the properly treated side.
What this means is that BW will continue to improve the neglected trim, the longer it's been allowed to soak. There is a direct relationship to durability. The better you apply BW, the longer it will last. Over time, as you start to see it fade, a quick application of BW will prolong the life.
Don't have any Black Wow? Buy it from one of the NAM vendors such as
Alta Performance Products,
Detailers Paradise,
MINICorsa,
MINIMania.com,
Way Motorsports, or from myself at
ShowCarSupplies.com
Richard