In my experience parangs are generally not quality items. They are basic work-a-day tools for use in tropical, jungle environments by people who mostly want something cheap and practical. They don't have much practical use in this country. Having said that, Ystranc uses one, though there may be better tools, for cutting brash - so they are not useless. Quality knives and axes can be sharpened to 'shaving sharp' for a very good reason - they need to be quality to get this sharpness and they need this sharpness to do the job they were intended for - parangs don't. A parangs just needs to be sharp, and a basic stone will give them a good enough edge for them to do the job that they were intended to do. You have a nice piece of kit, very useful in certain circumstances, but to try to make it shaving sharp and shiny seem to me to be rather futile. You need the right tool for the job. I bought a parang to go to the jungles of Belize, I have never used it in the UK - apart from cutting down some nettles and brambles. A quality axe or knife will serve you better here, and you can make them shaving sharp and shiny, just like they deserve to be.