Hello all.  I have made a mould using the Uni-Mould system.  The pattern was finished with Pattern-Coat High-Gloss, and had some scratches (I had started with 80 grit).  But I made the mould anyway and the scratches, as expected came through.  So the scratches on the mould were now male scratches and easier to remove.  So this time I started with 400 grit wet (wet, circular motion, 3 sessions), followed by 800 (wet, circular motion, 2 sessions), followed by 1200 (wet, circular motion, 2 sessions).  Attempted polish with Topfinish2 and medium/soft blue pad in DeWalt polisher, but ended up with deep scratches.  Also have attempted NW1 cutting compound with medium/hard orange pad, still no cigar.

I have ordered 1500 and 200 grit, I will start again at 800 grit and go through 1200, 1500 then 2000. And then probably NW1.

Any other suggestions? You can clearly see the scratches in the pictures, the phone camera picks them up really well. In the third picture, you can see how rough the surface is in the light section. One problem is that the entire mould is concave, but my pads are flat.  Are there hemispherice pads available anywhere?

On top of what Warren said, be aware that 1200 grit is the real minimum for polishing, and as such it will actually take a long time to polish out completely. 1500 will polish faster, 2000 is fairly quick, and 3000 will polish out almost immediately. 

Wayne, it took me 5 years of doing this professionally to get to the point where I can wet sand and polish resins and gelcoats to a genuine mirror finish. It is not easy, it is a skilled technique, and it takes plenty of practice. Just keep with it, the products are good so you will get there eventually.