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Here in Holland we have some onlineshops that are specialist in polish stuff. I use most of the time Autosol Marine shine.

Think the www is the place to look, or a local shop that sells polish.

As far as the shiny thing, you can use some marine polish.
Use a dremel on very low speed

Love the color pattern.

I have used more than once those plastic bags. Epoxy dont stick on those bags.
Some people use backing paper but imo those bags are easier to remove from the material.

Note: make dure that the...

Make sure that your paper is wet on both sides from the epoxy.

I make it like this way:
I use printing paper ,white& color paper
Make sure you have a flat onderground (wood or steel plate)...