You can sew over fabric glue but you should always wait until the fabric glue is dry. When possible though, you should just pin the fabric and sew instead of gluing first.
When it comes to fabric projects, fabric glue has its usefulness. It can quickly and easily bond fabric together.
Fabric glue is mostly used on things that are hard to sew or temporary items. Some common uses include making pillows, headbands, and scarfs that no sew.
When looking at the comparisons between using fabric glue and sewing to bond the fabrics together, using fabric glue is usually more convenient, easier and faster and very safe.