As Primaloft is more common over here i got an answer on a german forum,
for the case anyone comes across some primaloft and wants to try it, i'll summ it up here including the answers i got on the german forum
ODS
Originally Posted by
"Barleybreeder" and "GFH"
Primaloft is a loose filament insulation material, it needs to be quilted to a supporting layer.
In order to avoid cold spots due to the quilting, using 2 or more layers of primaloft with offset stitching is a common implementation.
If for some reason the insulation cannot be quilted to the shell layers the scrim layer it comes on can be used for support.
Other materials notably Vlieseline H250,G700,G785 and substitutes can be used aswell.
When working with the Primaloft one needs to prevent the needle catching on the filaments
as it would draw them into the machine and thus might tear it. To do so a thin paper (newspaper etc.)
or stripes of one of the aforementioned scrim layers can be placed along the stitching lines.
It can be removed after the sewing as the thread will not cut trough the Primaloft or left there to further prevent tear off under harsh handling
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