Difference between bound seam finish and hong kong seam finish
At first glance, a hong kong seam finish and a bound seam look identical. However, if you flip each application to its wrong side, you will spot the main difference right away:
In a hong kong application, a single layer bias binding is used to wrong around the fabric raw edge. On the application's face side, the the bias strip edge is stitched in a folded style to resemble a classic bound application. If you flip the fabric edge to expose its wrong side, you'll notice that the layer is not folded it but rather left unfinished. The bias strip is topstitched form the application's face side to tach the raw fabric layer underneath and thus seal the garment's seam allowance edge. A hong kong application is much easier and faster than a conventional bound finish.
In a bound seam allowance finish, the bias binding is folded along both lengthwise edges, providing an identical look on both the right and wrong side of the application. The most common bias binding style is a double fold binding which is pre-folded to encase the raw garment edges, after which the binding is topstitched to permanently seal these edges. As a result, all fabric raw edges including those of a the bias binding are fully enclosed for a clean, professional finish- this is the main difference between a bias bound finish and a hong kong application, the latter leaving one the bias strip's raw edge exposed.