Read a cool comment by Bockscar, 2010. Don't know if he's still active. To all then refering to the boiling water trick. My needs: I'm starting a Renwal trident boat w/ interior. I want the unglued seam of the hull halves in as close an alignment as is practical (when closed of course). When I rubber band the two empty hulls together they fit well after some adjustment. Do you think I can heat them slightly so they'll stay that way after cooling and unbanding? Possibly not, but inquiring minds want to know. How about immersing banded hulls in about 185 water for a few. Any suggestion for time. Thanks dgb