Never pin again. The excellent formula of this product has been designed by professional quilters Shelley and Bernie Tobisch, is ideal for quilting applique and sewing. It is water soluble and sets quickly with an iron. It makes it easy to create super straight lines and precision seams, making it an excellent choice for plaids and stripes. Shelley's book "Easy Precision Piecing" gives you everything you need to know about this new approach to accuracy and organization for quilters.