Has anyone had any success using Kodak Polyfiber F?

I just acquired and old but nearly full box of this stuff and besides the fact that it fogs like crazy in Agfa Multicontrast developer, it curls up like a dried leaf as it dies. I have never used a paper that was so... curly.

Any ideas how to control the fog and the curling?

I was going to try some cool Dektol to work on the fogging problem but I don't know what to do about the curling. I have tried rack drying and hanging.

I don't suppose you have a press for dry-mounting? That might work after the fact, can't say for sure though... it could just be that the paper's too old. And the fog, that could be from anything - previous exposure to light, age, bad chemicals, just about anything.

I've had some success with 50 cent full boxes of 20 year old paper, and much failure as well. If it's old, I find it best to not spend too much of your life trying to figure it out, but that's just me. We'll see if I feel the same way when I crack the box of 16x20 old-school seagull paper sitting in my basement.

As Detroit said, A dry mount press would help, but there expensive.
I usually use a drying rack, and take an additional screen upside down on top of the prints to help control the up-curl. To help flatten them additionally, I put the prints in a blotter book between to rigid plates on the warm (this time of year) hot water radiator and place a car battery on top for a weighty press.

You'll definitely want to keep them as flat as possible while drying so you don't crack the brittle emulsion later when trying to flatten an excessively curly print.

My two cents worth at least.

also if you go into all the trouble to get nice flat and well developed fibre prints, don't forget to thoroughly fix and rinse the prints. Rinsing can be as long as one hour if you don't use a washing aid agent. don't save time on fix and washing... yellowing of the pictures will make you very sad in a couple of years.