Hmm, Driclor seems to work for my palmar HH. As a rating on 0-10 with 0 dry and 10 dripping wet my palmar HH would be probably 6-7 as it was wet all the time, couldn't shake hands without wiping, couldn't hold onto a pole without slipping etc.
I've been dry on the hands for about a month now.
I think it all comes down to technique on how to apply it.
For my hands, I put a decent amount all over from the places I know I sweat (palms, fingers, thumbs, wrist etc). I make sure my hands are completely dry before applying the Driclor (using a heater and baby powder) then once I've applied it I make sure my hands are completely dry again (heater). I then carefully put a plastic bag over my hands with socks to hold them in place. (A bit weird but hey if you get results). I did that every night for a week and now I'm down to 1-2 times a week.
Just wanted to post as I've had some success with Driclor and that Iontophoresis isn't the only treament for palmar HH.