Does it matter if pillow tick material isn't 100% cotton ie: Cotton /canvass blend? Thanx Harold

If you're meaning Levi or blue jeans, or like boat canvas.. most of the older canvas is 100% cotton. There is new canvas which is a mix of material. Why they still call the new stuff canvas I have no idea. Some pants of course are now mixed with man made fibers and that can cause you some definite problems.

My rule of thumb is, if it is not 100% cotton I do not shoot it.