Hey all, 

i have found that particularly IN resin will take a long time to cure and will absorb water and become cloudy if worked before it is fully cured. My experience involved wet sanding a  part that had been made with IN resin and fished with coating resin. When i wet sanded the coating resin everything was fine unless i sanded through to the IN resin underneath and then bad things started to happen in much the same way as you are describing. Cloudyness - patches moving around, spreading and no hope of improvement. the more you work it the worse it gets. I would try either baking before you do any finishing. Or . dry sanding then vacum and lacquer with 2k all wearing gloves to prevent any contamination on the surface. I do something like the later but i finish with coating resin not 2k as i need a very durable finish. Basically its the water in my opinion.