Viscosity Measuring Cup (#4 Ford Cup) for Paints and Ceramic Glazes For measuring thickness of automotive paint, base, clears, sealers, stains, ceramic glazes and more! Verify coating viscosity prior to painting and reduce poorly atomized coverage Durable, rust and corrosion proof nylon construction lasts for years #4 Ford Plastic Viscosity Measure Cup (1/8" Opening) with 8" dipping handle Detailed instructions and flow (viscosity reference) chart included