Architeuthis is spot on with the decks on most U36s. These boats are now approaching 30 years of age and with screwed down teak decks youll find that the screws, especially at the butt ends of the strakes, have 'sawn' loose from the FRG, the 'thiokol caulk' under the teak will be 'shot', and the 'core' will be loaded with water. Such decks can be rebuilt but its a horrendous time consuming job and not all that inexpensive even as a DIY project. Unless such decks were constantly maintained by removing the OEM screws and replacing them with larger diameter (shoulder) screws such decks will 'usually' be sodden.
Ditto, Tayana, Baba, etc.
Also most of these boats have quite inferior 'metallurgy' and very rot/corrosion vulnerable chainplate bases. These (all) were 'high maintenance' boats and most owners 'didnt'.