Varnishes are liquid products that solidify when exposed to air. They are used to cover, protect, and embellish surfaces. Varnishes contain agglutinants and volatile solvents. The main agglutinants are epoxy resins and acrylates, and these acrylates are the substances that produce sensitization most of the time. We explain the use and handling of these varnishes and present four cases of occupational sensitization to acrylic resins present in wood varnishes used by four workers.