Sewing marine vinyl by hand is possible, but it will take a long time to do. Marine vinyl is also a tough material to sew and can hurt your hands if you do it for a long time. If you need to sew long stretches of marine vinyl fabric, it would be best to get the assistance of a sturdy sewing machine that can handle dense fabrics. But if you only need to sew small parts of your marine vinyl project, such as securing ends and corners, the task will be worth it. Follow the steps below for sewing marine vinyl by hand. Make sure you use a thimble or two on your fingers to protect them as you push your needle through the thick marine vinyl fabric. Make your stitches longer to better hold the materials together. Short stitches are prone to ripping early. Use a strong and sharp needle made to handle thick and tough fabrics that are difficult to sew. Experts usually use needle sizes between 16 to 22. Match your tough needle with a heavy-duty thread such as polyester or nylon. Avoid using pins to hold your seams together. Use a double-sided tape or a few drops of fabric glue instead. Some marine vinyl fabrics can be very thick to be sewn by hand, so always work with safety and caution.