I am teaching myself how to paper piece blocks for a quilt , I have watched videos and read books about this , and have made my first block , it is a star , it turned out great, as i was ripping the paper of of the fabric I noticed some of the stitches came undone so i went back and renforced them , now on my next patter that i am making the directions say to take the bobbin and thread out of my machine and to "sew" over all the lines on the pattern piece first before using it ? because i didnt do it on the first pattern is that the reason some of my stitches came undone? i am using copy paper for my patterns, other than this problem i had , i am starting to enjoy paper piecing !!!