For the longest time I taped my watercolors. But I always found the water and paper was too strong and the tape was never strong enough. My paper would always wrinkle and what not. I know I could buy watercolor blocks. But for bigger pieces what was I gonna do ? So I searched around on line and learned about stretching watercolor canvases.
Basically I take my sheet of watercolor paper. I soak it in the tub with water for 10-20 minutes minimum. Then I take it out and I lay it down and then put a wooden panel on top of it. Then I stretch the paper like I would canvas to stretcher bars. I staple all the edges to the wood. And tada ! I then have a stretched watercolor canvas. I never worry about wrinkles anymore. I love it. I still use watercolor blocks but I use this method for larger pieces.