sounds like "bearding". some poly batts are known to do this. i used a batt recently for simple project that was supposedly punched or something so that it wouldn't do this. it did. i don't have too much trouble w natural fiber but the poly always beards like this. i use a lot of black fabric. hobbs has a nice black batt. it is dark, shouldn't see the bearding but you do. fine shiney "hairs". will follow this discussion and see if someone has found something that doesn' beard, at least so noticeably.