kind of rule of thumb...use invisible thread on wall hangings and quilts for show which will not be used and washed often...use good ole quilting thread on quilts which are for use...
not all of the invisible threads melt in the dryer, but all of them are kind of 'pokey' when a tip sticks out.....we've all had that item with the tag sewn on with (fishing line?) drives you crazy until you get rid of it!