I also have the 1200 and use just about a cap to a cap-and-a-half full of Nu-Finish for the tumbling operation. It usually takes about 2.5 to 3 hours of tumble time to get them really, really shiny.

I also 'thin' the Nu-Finish with mineral spirits, which does two things, it extends the Nu-Finish and helps the media to absorb the concoction.

You can adjust the suit your needs, but this should give you something to go by at least.

Works great!