I have finally fixed the leaking forard Gebo hatch, after initially tightening the handles, replacing rubber seals and then the sealant holding the lenses, all which were unsuccessful. We have now used Fixtech (superior Aussie version of Sikaflex) around the frame joins and hinges which has resolved the leak. We also have one way perforated film on the lenses, as they use for bus advertising, which overcomes the unsightly crazing of the hatch lenses.