We've got an old wooden greenhouse which is need of a bit of TLC. One of the roof panes needs relacing which basically means I need to remove all the others to get to it, so whilst I'm at it I'm going to sand down the woodwork and slap a couple of coats of preservatove on as well.
When it comes to replacing the glass (or acrylic/perpspex in this case) what's the best method to use. Was thinking a bed of putty, then perspex panelled pin in place. Do I need another putty bead or wooden bead on top? Or could I just lay the glass directly on frame and then a bead of putty to hold it all in place. Would silicone be a better option ?

Cheers