The processes in our books and videos have been developed and tested for use with genuine DASS ART products. In fact, those products were specifically developed in order to make the processes work! Third party products may or may not work, even if they claim to be the same as ours. Genuine DASS ART products are currently only sold on www.DASSART.com, and through our ETSY store (DASS2Sell) – they are not sold by any third party (we’ll let you know if that changes), and we do not private label our products for anyone else. For support on our products, please first verify that you are using genuine DASS ART products, and then visit our support web page at: http://dassart.com/contact-us/