This video shows how to make a lightweight waterproof board to support a small watercolor painting while you work. This method will not prevent buckling, but
Watercolor Techniques: a 6th grade experiment
Thinking about values when sketching with watercolour - Liz Steel
Watercolor Basics: Working In Batch: Trimming Paper to Size
The BEGINNER's Watercolor Lesson How to paint with watercolors
How to Make a Lightweight Art Board/Tool Holder for Watercolor
Making adjustments when sketching on location - Liz Steel : Liz Steel
Paint Beach Coasters in Acrylics + Resin Cover
Painting With Gouache
Foundations of Watercolor Course
How to Paint a Watercolor Wash Background
Dragonfly Spirit Studio
My basic 12 colour palette (used in my Watercolour course) - Liz