Johannes Vloothuis recommends this tool for making stretching watercolor paper easy! Avoid the hassle of soaking, stretching and taping.
Redcollie Watercolour Stretcher
Essential Tools for Paper Crafters - FeltMagnet
How To Stretch Paper
4 ways to stretch watercolor paper - Watercolor Affair
Art Shed Blog Watercolour 4 Tips for Choosing and Using
How to Choose the Right Watercolour Paper
How to Stretch Watercolor Paper, the Classic Method by Ross
Watercolor, Page 2 of 46
Watercolor Supplies — Charlene Collins Freeman Art