https://www.sherwin-williams.com/homeowners/products/crown-japan-drier Use this product with oil-based paints, oil-based enamels and varnishes
https://www.tinboats.net/varnish-vs-polyurethane/Japan Drier is a common drying agent that can be mixed with other oils such as boiled linseed oil and alkyd resin paints and varnishes to speed up the “drying” or “curing” process. It’s also used by professionals to speed up controlled drying when they need to apply several coats on the same day. Japan Drier is a special blend of lead-free drying agents that accelerate the drying ability of oil-based paint, enamels, varnish, and polyurethane. It is especially effective in highly humid or cool weather conditions. Although Japan Drier may appear purple, it will not affect the color of your coating. (varnish or paint). Normally, one ounce of Japan Dryer per quart of paint or varnish and mix thoroughly. Do not exceed 4 ounces per gallon.
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