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Just to share some tips related to flat french seams that can be used on dashboards, consoles, etc. and other on covers.

For this demonstration I am using a solo needle for everything. A 110=18 needle size. The thread size, black and yellow is 92 size.
The stitching length can be shorter than 6 mm the measure I am using. Regularly, if the thread is thin, in this case 92, the stitches would be 3 to 4 mm long.

So, when to use the long top stitching. If I would have used a thread size 138 the stitching length would have been from 4 to 6 mm long. Car seat covers do not use longer stitches. 6 mm is the maximum length as a standard. Longer stitches, such as 8, 9, 10 to 12 mm are mostly used on furniture. Thicker threads are used too. From 138, 207.

Two ways of crossing the french seams are also shown. One has a bulky crossing and the other shows how to avoid it.

I hope this information is useful and you also find the video enjoyable!

Cesar

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Content:
00:00 Classic French seams joining
08:59 Custom French seams joining
22:34 Comparation