we recently sprayed the moisture repellant on our vinyl sides and applied the sealing glue to the sewed seams where the canvas/vinl ends attach to the bulkheads by the stitching. all of these materials are very cheap to buy and I bought at a RV dealer, some may be available from Wal Mart also, not sure. We had a problem with leadage through the seems after some canvas work was done.
we also had a condensation problem also but this cant be fixed to well , when the air is certain temp and RH a certain amount the water will condense out, sometimes opening a vent can help some, but this does not sound like what has been described. We have some sort of moisture issues in our hybrid; condensation, drying out after rain, a few drips during a really hard rain, etc. However, hybrids are lots of fun we really enjoy ours.
2008 Wildwood LE 29BHBS