I think it depends a lot on the type of polycotton you are using. I use it quite a bit and have had no problems with it. I try to make sure that there is more cotton in the blend than poly, and never use less than 50% cotton. And that is only if it has that nice look and feel of cotton. If you are using all polycotton, then I don't see a problem at all. I know that the Amish often do that. I am not aware of an issue with durability as long as it is not the very thin fabrics you often find in the all polys and the blends used in curtains, etc.