Fibreglass tape is self adhesive, so it doesn't need to be embedded in a layer of compound. You can apply the tape to all seams in a room before putting on the first coat of compund.Mesh tape is more elastic. So joints are likely to develop cracks. Mesh tape should be covered with setting type, compound which is stronger than drying tape and will compensate for fibre glass mesh's greater elasticity. With patches where joint strength is not as much of a concern as with a full sheet, mesh type allows for a faster fix. Mesh tape provides the best protection against mold.Mesh tape and a layer of compound to fill the gap provide a good substrate for finishing the corner with paper tape. This tape is also used by drywell finishers to patch holes. Construction work is use for fibreglass mesh.