My first SLR was a CE4s and I still have it, but sadly it no longer works. It gave me many years of great service but eventually the electronics misbehaved - I believe due to corrosion. I took a lot of photos in humid rainforest, and the Chinon didn't have the kind of weather sealing of current pentax models. If cleaning and resealing gave you a working camera for only $80 and you're keen to shoot film, I'd say it was a good deal. However, if there's problems with the shutter or light meter, it may not be worth doing. Have you tried shooting a roll of film to see if the shutter and light meter are working?
I'm impressed that people are still keen enough to shoot film!