novicequiltergrandma

I've only done a couple small projects before. This spring I decided to make a quilt for my grandson's bed. I bought pre-cut strips to make a puzzle quilt. Because the puzzle pieces had to "interlock" I had to cut up all the individual pieces to lay out the whole quilt before ever sewing anything. The layout took forever!!!!!! By the time I was ready to sew, many of the pieces had frayed badly. I was careful when sewing to make sure I wasn't just sewing frayed edges together and did an overlock stitch on some of the worst ones, but didn't do it on every seam. Before adding the fleece backing, I decided I should wash it just to make sure the colors wouldn't run and the seams would hold. Well, the seams came apart in several places and the edges are now frayed well past the seam allowance. [ATTACH=CONFIG]434683[/ATTACH][ATTACH=CONFIG]434684[/ATTACH] Is there a way to fix this?