OK, I could be back from the brink.......
Here's what I was dealing with. I had poured the resin and then applied some acrylic gel to make ripples over the top of it. The ripples were a disaster (should have practised first!), so I let them dry and then poured some more resin over the top to cover them up. Two big problems: first, the resin was not coloured enough to cover the ripples and second (and even worse), the resin reacted with the acrylic gel to create the horrible effect you see here:
This was the point before Xmas where I was ready to give up. However, thanks to some encouragement from everyone on here, I decided to persevere. I started practising the ripples on test pieces and am getting confident I can pull the effect off. So I poured a heavily coloured layer of resin over the mess above and this has covered it up. So I now have this:
This looks OK and although the water has gone a bit deeper than I intended, I think it works.
I also made the tint for the resin slightly lighter so that it tones better with the mud colours of the groundwork, and I think this looks better than my previous version.
I am going to do ripples on top of this when it has dried, but I am still practising and will carry on practising until I am sure of my technique. Fingers crossed, the next post should be in the "Completed" section.......