David:(posted 8320 days ago)Me again.
The above advice is good. I have found a lot depends on the film you are using. With Kodak, Ilford Fuji or Agfa films the curling is minimal and with using weights to dry, there is no problem. If I use Eastern European film such as Foma etc, the curling is really bad, so it must be something to do with what type of base material is uded or how it is formed/rolled in manufacture.
Good luck.