Using the right thread is very important in order to achieve the perfect finish in a sewing project, understanding the different kinds available in the market will prevent problems such as broken thread or uneven tension. You must also be aware that there are different thicknesses, and these are specified in numbers, the higher the number, the finer the thread. Number 50 is considered the medium thickness suitable for most fabrics.
I normally use a polyester mix thread which is described as ALL PURPOSE, SEW ALL or GENERAL USE because most of the time I am sewing cotton fabric to which I have fused interfacing which is a synthetic material.
Here is a list of the most common kinds of threads:
POLYESTER/COTTON MIX: multipurpose thread for general use.
COTTON: ideal for natural fibers, such as linen and cotton. It is also recommended for quilting.
SILK THREAD: for sewing satin, silk and other delicate fabrics, as well as for decorative details.
BOBBIN THREAD: it is thinner and recommended for machine basting, hems and delicate fabrics.
INVISIBLE THREAD: synthetic and perfect when you want to hide the stitching in projects such as quilting. It is also recommended for man made fabrics such as fleece.
Besides all the ones mentioned above, there are heavy duty threads for upholstery; thicker threads for decorative top stitching; wool thread for embroidery and even metallic thread for decorative purpose.
Finally, don’t forget to check the settings on your machine, the wrong tension can really spoil your sewing.