Ruth from Elkland Mo. writes
Chapin does not recommend using diesel in any of their sprayers including the Chapin Concrete Sprayer 3.5 Gal. (1949) because of the safety concern of its flash point and the damage it can cause to the seals. Some folks have used the Chapin Xtreme sprayers, but we cannot guarantee that it would be fit for multiple uses after. Other customers will just use an inexpensive sprayer and dispose of it after use. Be sure not to leave flammable products under pressure.
Answer last updated on: 09/07/2021