Yup, I use those pump sprayers too. I used to have another one for hair spray, and I'd fill them with spray that came in the regular non-aerosol bottles. I can't stand the waste, toxics and greenhouse gases involved in single-use aerosol cans.

Only thing is they're a real PITA to clean. It can be done though. Very warm water and a lot of dish soap, pump and spray through about a kawillion times, repeat with plain rinse water.

But I don't obsess over the amount of oil I use for sauteeing, and more often than not I'm cooking beans in the pressure cooker which requires a tablespoon or two of oil to keep the foaming down. So mostly I use the oil sprayer for greasing my silicone baking pans. Not that I do a lot of baking... and that's pretty much the only time I use butter (never margarine or crisco)