Roof maintenance and spares

I have a Hartley lean-to greenhouse purchased from you in 1998 (Order HH 2036). It has developed a leak at the joint between the roof pane nearest the door and the sloping pane below it – possibly caused by my attempts to clear out moss from the inside of the aluminium bar and the roof pane. Is there a simple cure for this, or should I simply put a bead of mastic along the joint?

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Posted in: Greenhouse Maintenance