warming polarizer and print film?

[Mark Erickson]

All, 

I've been using Kodak Portra 400UC for snapshots lately and am pretty happy 
with its color palette.  I'm thinking about using it as a general travel 
film and am wondering how it responds to filtering (as compared to slide 
film).  I have a bit of experience with filtration (e.g., ND Grads, 
polarizers, etc) and chromes, but I don't know much about how print film 
responds, particularly to warming filters. 

Can anyone comment on what kind of differences I might expect compared to, 
say, Velvia or E100VS? 

Thanks, 

Mark