Today I started to make the hard edges I need for my model starting with the head because I thought of working my way down from there. I extracted the pieces of the head using the masking tool, and then I clipped of the edges to make them straight. Then lastly using the hpolish brush I got the hard edges effect.
This is the same process but at an earlier stage with a different piece of the helmet, it takes a lot of effort and time to clean up an extracted mesh but I was picking it up fast. The clipping brushes normally give of a piece of the geometry which is not needed and it’s very hard to get rid of that very thin plane like geometry.