Whether I'm free motion quilting or using the walking foot....I really don't have the time or inclination to go back, rethread a needle and bury the end of the thread in the batting. What I do is at the start and end, I bring the needle up and down 3 or 4 times to tack the end and then I just cut off the end. I don't make heirloom quilts or ones that are going to major quilt shows so don't know if a buried thread is what the judges look for, but it works for me and no one ever told me that my quilting unraveled.