A floating tank blanket includes one or more floats. Each float includes upper and lower sheets that are chemically inert and coupled together such that a hollow interior or cavity is defined between the upper and lower sheets. A positively buoyant or floatable filler is within the hollow interior or cavity for imparting or increasing floatation or positive buoyancy. The one or more floats are arrangeable within a tank for covering at least a portion of a surface of a liquid within the tank. The one or more floats allow a part to be immersed into and removed from the liquid in the tank while the one or more floats which remain cover the at least a portion of the surface of the liquid and inhibit fumes from escaping the tank.