I'm always having trouble getting my backing fabric to stay wrinkle free. I have tried pinning the fabric down first, I've tried taping, clamping it to a board & I just can not get rid of the wrinkles after I Pin baste the sandwich together. I have tried repining it again after all pins are in but when I'm guilting all of the darn wrinkes are back again. I have more wrinkles in my project than an 80 year old person. Lol. Any suggestions will be most appreciated.