Oversewing/flat felled seams - Car Upholstery Basics

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As mentioned in our previous video the most basic sewing in upholstery is the 'closing sewing or blind sewing' which is used to sew together two or more pieces of leather or vinyl in order to give shape to an upholstery project, such as covers or others.
An oversewing is considered a top stitching which is done to reinforce the edges of a cover or other items. Besides, it gives shape and adds an ornamental view to the cover.
As explained in the previous video, to do the first closing sewing I have used a 110=18 needle size and 92 (número 8 en México) polyester thread size. To get a tight and neat sewing I made short stitches 3 mm long.
For the top stitching I made the stitches 6 mm long. I changed the 18=110 needle for another 130=21 thicker needle. It is useful to avoid the bending of the needle. It is medium size and also is capable of sewing with thicker 138 (número zero en México) thread size.
To perform the oversewing I used a spring loaded right guide presser foot. As we can see the cover remains under the sewing machine head.
In car upholstery is much better the use of a presser foot with the guide on the left. It means the cover would be handled much better because it remains on the outside left area of the sewing machine table. At any moment I will purchase a left guide presser foot.
The same process and tips are applied on leather material.
I hope you find this information useful!

Cesar