FoundryGeneral® Metal Cleaner HF is used as received. It can be applied using either spray or brush applications. To provide proper removal, it is recommended that the product be allowed to set for a period of approximately three (3) to ten (10) minutes, depending on the severity and thickness of the resin to be removed. Due to the relatively slow evaporation rate, when compared to Methylene Chloride based formulas, additional care or air blow off may be necessary before resuming production. Please refer to the MSDS for proper safety instructions.