I'll put in a response since you asked so nicely...
Some other info XP seals (the #day ones that sit in in your bag): PWI SAYS they are supposed to stack with the XP scrolls that you pop (of the same type - party or solo). I have personally never seen this to be true so I would say that is a lie. Looks to me that whatever has the highest XP again rules. So for instance if you have a 200% 3 day party XP seal + pop a 400% party scroll you will really only see the 400% I have never seen 600% XP from both and I have used both on occasion. This may of course be fixed in servers other than here.