Extra to what Dorff says above, you will encounter problems with a 36 exp film if you try to load it fresh out of the camera. This is because the camera tak-up spool puts a reverse curl in the film. Best to leave it in the cassette for a couple of days before loading into the dev tank. I dry spirals on a gentle heat (e.g. top of a radiator) before use to make sure they are bone dry.