Originally Posted by I am JJ
One problem I have had using poly fabrics is --I have to be careful when pressing. If the iron is too warm or if you wiggle the iron around, it is very easy to stretch or otherwise to alter the shape of the block or pieces.
And this is why one should use all cotton, especially for the distortion that can be caused just by sewing. Another thing that poly/cotton blends do is "pill". This is when agitation creates little balls of fiber found on the quilt top or back.
Old quilts were made of all natural fibers--wool, cotton, silk, linen and all of the man made fibers (nylon, polyester, rayon to name a few) were developed from 1930 and onward with nylon being the first.