How to Oversew Foamed Panels - Car Upholstery Basics

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Oversewing is the most basic sewing done over the seams to reinforce a closing or blind sewing . It is also considered as an ornamental sewing for a cover or other upholstery items.
An upholstery student must learn and understand well the usefulness of this basic topstitching.
Regularly, this stitching is done on the upper edge of a lateral panel that surrounds a main foamed panel. There are some exceptions when the oversewing is done on the main panel edge.
I show in this sample several useful tricks which are used when the lateral panel is foamed.
Usually the lateral panels are foamed with thin foams: 3, 4, to 5 mm thick. Headliner foamed materials are useful for this purpose.
To ease the sewing process and get a nice oversewing the most important key is to flatten the edges that will be sewn down.. A previous sewing is done at a distance of 8 mm from the edge. The final closing/blind sewing should be done at 10 mm.
Bulky junctions are flattened by cutting the seams on the reverse side and resewing on top back and forth many times.
Some upholstery shops use an overlock sewing machine to flatten the edges of vinyl, leather or fabric.
To ease the sewing process for this topstitching I have used a 138 size thread on top and a 92 size thread on the bottom. Things are much easier tho handle and the outcome is also safe and nice too.
I hope you find this video useful!

Cesar