Hi there. I am a big follower of Pink Pettycoat creations and their website. A good tip from the creater of that website is to use an inkjet fixative spray by Ghiant, the matt version. I have bought this, and you just spray the card and let it dry for about 10 minutes and then paint it. It really does work. Not cheap, I paid about £8 including postage from ebay, but it is a good sized can and it will last for ages. Hope this helps.