Done - Engine bay is now painted with top coat. I have put on what I think is the minimum of 4 coats (although some is thinner). The final finish is ok with a little orange peel in some areas that are difficult to cover without over spraying. The minimum of cutting back would give a good finish but I probably won't do that for now. Amazing how those ellusive dents seem to jump out once there is a shiny finish on it. However once the Engine bay is filled with engine bits and dirt then paint and other faults will go un-noticed and we will think "was it worth the effort?"!!