I've searched QB and online for an answer to this question with no real success. I am making a quilt for SIL using 30 blocks of embroidered tractors (they are wonderful and ea one different).
The unfinished blocks are 9x9" on white muslin. I can't get it out of my mind that I should put another square of muslin behind each of these blocks before I start piecing. So opinions please. Do you think reinforcement is necessary?