Never noticed that on mine, either the Scarp or the Moment. I do apply seam sealer (diluted) twice .
This is how I do mine :http://www.youtube.com/watch?v=mYjOkxR4sgc&feature
TT raccomends using a sponge brush, I still use a standard paint brush but for seams in particular the sponge should be easier.
Keep in mind anyway that the inner (the fabric version...) is water resistant.
This is the inner holding 2 liters of water :
(does not sip through even touching it)