Here are a couple of links about needle points and their uses.
https://craftworld.com/cms/sewing-machine-needle-guide/
https://www.schmetzneedles.com/pages...e-needle-chart
I'm thinking that the "
clucking" would do it all over as I'm thinking insulbrite has a mylar layer that would make a different sound than a regular quilt sandwich. According to https://sewingiscool.com/insulbrite-...ns-directions/ it just says that the needles need to be changed more frequently, but does not address size or which point type needles to use.