(hydrojunkie quotes)..If a wood over frame boat is properly built, there is no reason for the skin to flex over the framing. This is one of the reasons I won't build a boat with CA and then coat the joints with epoxy after the fact. Epoxy won't penetrate a joint that is held together by CA, so those joints will, in my opinion, always be suseptible to failing due to the brittle nature of CA .......CA pentrates deeper into the wood then epoxy. Some reson why they crack is CA wont flex and epoxy will flex. Oh HJ it also depend on what CA your using too.. Theres a flexable version out as what I was told.