Sorry, I did not think to take a "before" picture of my bed panels before applying RR.
But here is an "after" pic:
My panels were a chalky, uneven lightish grey color before I applied the RR.
I also apply RR to all of the bed wall plastic and tailgate plastic, but not the actual bed mat, with great results.
It may start out looking good on the bed mat, but I bet it will start cracking and flaking in short order due to the way it dries.
I also apply RR to any and all black plastic exterior trim, rear bumper upper steps, mirror covers and along my running boards.
For me, I have to reapply to my bed panels a couple of times a year and I feel that is mostly due to the fact that they catch the most direct sunlight as opposed to other trim pieces and the interior bed and tailgate plastics.
To apply, I start by scrubbing the bed panels really well with a plastic bristled scrub brush and a bucket of Dawn soapy water and let them completely dry.
I then put the panels back on the truck, one at a time, and apply the RR by pouring a small puddle of RR onto the bed panel and working it around with a section of foam car washing sponge.
I usually buy one of those dog-bone shaped sponges and cut it into thirds to use an my application tool.
No need to apply a bunch of tape and stuff to your truck as the sponge offers precision application even to vertical trim.
Just take your time and don't over saturate the sponge.
Also, I have applied in direct sunlight in the middle of the summer heat with great results, even though others prefer to apply in the shade.
Both have worked well for me with the exact same results.
The small can of RR allows me to do my bed panels and all other trim more than three times, so you should have plenty, as well.
Make sure you close the can tightly as the product will go bad and dry out if left exposed to the air during storage.
Try to remember to grab some before and after pics, if you can.