Colin, I have not had to do any treatment with the paper for Pt/Pd. I coat and let it air dry for an hour, or alternately blow dry, and let it sit for 10 minutes to re-absorb some humidity from the surrounding air. I am using the B&S Cold Bath developer, and I am getting a very pleasing warm tone with pure palladium.
Thanks Fred, this is very good to know. I've never actually tried not treating it, so you might have saved me a step there. Thanks again.