Shop watercolor stretching boards. Find a variety of sizes for many watercolor uses. Also, shop the tools you need to properly stretch watercolor paper.
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The importance of stretching watercolour paper
Artist & Craftsman Supply Philadelphia - *What's the deal with stretching watercolor paper?* Many artists soak or stretch their watercolor paper prior to painting. This is often done to lighter-weight watercolor sheets
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Stretching Watercolour Paper for a Better Painting Experience - Jackson's Art Blog