MIX&FIX: DO-IT-YOURSELF REPAIR KIT FOR YOUR CEMENT. Mix&Fix is a fast-drying concrete repair kit. Simple to use, it dries in 15 minutes in ALL climate. It can be drill or paint after 3 to 5 hours. In a few easy steps, you do yourself the job of a specialist. No training needed, you repair your cement easily and fast. Mix&Fix will soon become an essential tool for your home maintenance.