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?

Hello.  I asked thepolishingshop.co.uk to see what they thought, and I got this reply all but a few minutes later:

"Process-

We have a few options here-

Wheel based finis then-

Important to sand to around 1500

Then

Stage 1 - Glosswax 16 with a G quality mops (coolair or standard construction)

Stage 2- P175 Black with a WDR quality mops (coolair or standard construction)

IMPORTANT- Run Coolairs slow ie 1000-3000 rpm max, standard mops can be run faster but would still recommend 1000-3000rpm max. Please dont run at angle grinder speed, mops are rates to only 3000rpm

Its a standard process for a gloss finish, good example are bath companies as they are often sanded down then polished with this method.

I do have a liquid gelcoat system that would work, it comes down to if you want to use Pad or Mop as I am sure we can get the results on both. I think looking at the shape mop/wheel based would be better.

Best Regards Andrew"

I will give this a bash this/next weekend and let you know how I get on.