Before Hypalon is glued, the top surface of the fabric needs to be removed by sanding the surface. This used to be a very messy and time consuming process and contributed to the expense of manufacturing this type of boat. The Aeronaut Hypergrinder can sand or grind an even and accurate path up to 50mm wide in one pass, so large areas of fabric can be treated at a very economical speed with a finish which is more consistent than with manual grinding.