Uncle John,We use to buy the expensive toner aid till we found out that Krylon clear enamel, spray paint in a can works just as well.
Sorry to hijack. But can we use inkjet with tracing paper to make screen printing on wedding invitation?Toner Aid works great. Try hanging the film like you would a photo in a dark room when you just finished developing it. That way the can is heald upright. If the film is flat like on a desk you often will end up with drops which will mess up the film. Also too thick and your image will smear.
I switched to an Ink Jet printer and have no need to use it anymore. But I did use it for years.
Try not to breathe it in too much, you will be caughing up a lung.
Also, hold your film up to a light and see if there are any areas you missed. You should notice light doesn't come thru the area that is sprayed. If your film is already TOTALLY dark and light does not go thru it, than you do not need to use Toner Aid.