"Commercial wood floor finishing operation", the sanding of wood floors and the application of a floor finishing product, thereby altering the wood surface for purposes that are directly or indirectly connected with any business or other undertaking intended for profit.
"Floor finishing product", any substance formulated, marketed or otherwise intended for use to seal or coat wood with a protective finish by a floor finishing operation.
"Lacquer sealer", a clear or pigmented wood finish, formulated with nitrocellulose or synthetic resins to dry by evaporation and without chemical reaction, having a flashpoint below 100 degrees Fahrenheit, including clear lacquer sanding sealers.
Mass. Gen. Laws ch. 94, § 329