The process of preparing watercolor paper by expanding and securing it prevents buckling or warping when wet media is applied. It typically involves wetting the paper, then affixing it to a rigid surface until it dries taut. This preparation ensures a flat, even painting surface throughout the watercolor process.
Ensuring paper remains flat during the watercolor painting process is crucial for optimal results. Undesirable cockling can distort the paint application and create uneven washes. This preparation method allows for smoother color blending, better control over pigment distribution, and helps to preserve the integrity of the artwork over time. Historically, artists have employed various techniques to achieve this, signifying its longstanding importance in watercolor painting.