I have seen a few with this sanding and clear product work,yes sanding alone from 220-1200 will polish a plastic with no clear involved.
How would you like to brighten or even change your color for less then $50 with no spray paint at all.
let me start off here, this 10000000000% works and is real,I have done this with plastic for years from ATV's to paintball gear etc.
1st off you will need to go to your local flea market or craigslist and get an old bathtub,some kind of metal tub with legs,there out there.
Plastic will not work for the tub!!!!!!!
Now that you have located your haul this old junk tub for free,or very cheap(do not look for an antique).
Now go walmart etc and buy rit clothing dye.
I would buy 5-8 packages of your color,to fill the tub.
With your tub/pot elevated to build a fire under (I use a turkey frier) Let the water get hot,hot as it can.
Take your mud free plastic and soak it mixing the pot a little for 30-1hr.
The more you do it the better the job.
You can go darker not the other way,white,red,yellow will all go darker and color change.
You go do pink from white,looks insane!
You can not dye black anything other then to freshen it up.
This works best in bringing back the bright to your color,but will work for a color change.If you try this in cold then you will not yield the out look you want,don't think of changing color in cold,wont happen.
I learned how to do this with Paintball masks and I still have some I have dyed from white.
I Dyed most all of these masks from white to the current color.
The bottom 2 are the same mask,I dyed it from white to all black.
it is the only one I have a before and after of.