I was finishing up some last step polishing o my Tribal Scout 22 and thought I would share some tips.
First, I have my own mix I use to remove fine scratches and really slick up a finish.

1) is diamond powder, I mix it with solid mink oil. The stuff you use on your boots. This makes a paste to use like you would polishing wax. The difference is you use this with soft brushes to work in like you would a rubbing compound.
The key is to use just a little bit of diamond powder, the more you use the more course your mix will be. If I need a courser compound, I go with different plan car polishing compounds or a 500-grit lapping compound. This is something that you can use on high polished meatal or aluminum. It will work wonders on polymer frames after you have sanded,
It will bring back that dark luster.
2) Just to show you how little I mix up at a time. This goes a really long way. When appyling this mix, just make drops an inch or more apart. Make your drops the size of pencil lead, mix it around with a soft brush before you turn it on and then only on at low speed to work it in.

1) Medium soft brush. Use to mix in compound mix.
Remember this mix has diamond powder which cuts. So, by using this brush to start off with you are rubbing out scratches, but this brush does leave smaller scratches. By going over the same compound with a softer brush will keep making the scratches smaller and smaller.
2) Soft brush.
3) This is more like a felt bob wheel but softer. It is soft rags cut and stacked.
Use this one on the same compound to keep making the scratches smaller.
If your compound mix is getting dry you can add a small drop of mineral spirt or kerosene.
4) is a supper soft wheel. It is like threads of cotten and brings out the best finish.
After you have gone through these steps just use a soft rag to wipe off the mix.
Side tip: Try using mineral spirt or kerosene to do your wet sanding. This will keep oils in your polymer and keep sandpaper from loading up. You can use one piece of sandpaper for a very long time.

This stuff is the best polish for being a deep, deep luster to the finish of chrome, aluminum or even polymer but I wouldn't waste this on plastics there are other choices for plastic polish that work just as good.

Just add small drops of polish, wipe like you polish a car, let all most dry and buff off with a clean, soft rag.
BEFORE: already sanded it a fine grit paper.

AFTER:

Polishing is not hard, but it does take a lot a patience. The secret to it is learning how-to take-out scratches with smaller scratches. If you ever want to take a slide to a high polish, just ask me for some more tips on polishing. I have many years of experience in polishing steal.
WOW! Outstanding!