I have now had my first used acrylic tank for a bit over 1 1/2 years. I had used the Pentair scratch removel kit when I first bought the tank, and it work okay. I have since put some scratches back

The worst of these being on the outside.
I'm looking to see what other acrylic tank owners/builders have used to polish the outside of the tank, as I still have the sandpaper, but the polishing liquid abrasive that came with the kit is gone.
I have searched and found some using Google, like Micro-Mesh, Janvil ect; but there are many it seems and would hate to do more harm then good.