Using these Milwaukee sealant cutting blades is easy. First, attach the blade to your oscillating multi - tool according to the tool's instructions. When working on expansion joints, use the tapered end to plunge right into the sealant. For side - to - side scraping and cutting jobs, make full use of the side - ground edges. As for maintenance, after each use, clean the blade with a soft brush to remove any sealant residue. Store the blades in a dry place to prevent rusting. Be careful not to use excessive force while cutting as it may damage the blade or the tool. If you notice the blade getting dull, it's time to replace it with a new one from the 5 - pack.