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The difference lies in the amount of pigment in each. Transparent stains, although they appear clear, have some pigment in them for UV protection. Semi-transparent stains have more pigment, but still allow some of the wood grain to show through. Solid stains are basically like paint. They hide most of the wood’s character, but they offer the best protection from moisture and UV rays. The general rule is that the more pigment in the stain, the better protection it will provide.