Abstract: An applicator for volatile, highly viscous fluids has the following features:Protruding into the mouth of a pressure-sensitive, expandable tank containing a fluid solution, there is a narrow diameter brush point pipe, and, around the outer circumference of the brush point pipe, thrusting out beyond its end, there is a tubular brush point. This is the main body. Set atop the main body is a cap which covers the brush point. The interior of this cap is provided with a solvent receptacle. When the cap is closed over the main body, there are provided within the cap a vapor space which is filled with vaporized solvent from the solvent receptacle, and a columnar plug which dovetails within the brush point pipe after passing through the hollow part of the brush point, which is inserted into the vapor space.