For whatever reason I almost always wind up using a different quilting thread on the top than on the bottom of my pieces and never seem to have problems. I generally like the back thread to be uniform and perhaps several colors on the front. I also am a glue baster. I use watered down Elmer's school glue that I just drizzle on. When watered down, it is easy to control and avoid hard spots. I let it dry overnight before quilting and do not iron it. After a trip through the washer, all the glue is gone. Really like the method. I am about ready to give my pins away.