Eeach person has a favourite. A good friend that works with me like to use thick cardboards for multiple application. But, my personal favourite is standard white paper. I print and paste all togheter. Is easier, fastest and cleaner to cut. But, you can only use each stencil 1 time. 2 times with poor results.
(Im still learning how to make)
One last question. what do you use to paste the papers together?