I have not tried this yet, but will be soon, as my spray is just about gone! I am trying to be more frugal with our money.
1/2 C vegetable oil or canola oil
1/2 C shortening room temp
1/2 C all purpose flour
Place all in mixing bowl. Beat until it doubles in volume and looks kind of like marshmallow cream. Place in container with lid and store on counter or in cabinet. This mixture has a tendency to want to separate, so just stir it up before using. Use a pastry brush to coat baking sheets or pans. This will not leave a residue like sprays do. Keeps indefinitely. Worth trying that is for sure!