Well I normally do not prewash so the muslin was not prewashed. As for the knit, it wasn't prewashed either. None of it was. I also did minky with the dots and felt. I had some Moda Bella solid that I used along with some stiffer cotton. I didn't have a flannel piece.
I will say the burlap didn't stamp too well due to the weave but that was expected.
And yes, heat setting means I put a piece of cloth over the fabric with the stamp and pressed with the iron for about 15 to 20 secs. Not long at all.
Oh and UFO is UnFinished Object.