Jose martinez

We have a 2008 boat too and it depends on how your former owner looked after it.  Those that brush hard or use a power washer have done you no favours as this harsh action will remove particles of teak and reduce the thickness.  Recently I had the local shipwright make me a teak grating for the master cabin head floor and he commented on how good the teak was.

Here in the UK it tends to rain quite often and so we get a green algae forming on the surface, I use the salt water to cover the teak as the algae doesn't like anything other than fresh water so dies back.  If I use a brush its a soft one.

If you can't see the tops of the fixing points (circles) then your probably good to go, also see how proud the black jointing compound is, remembering that the jointing compound was probably laid at the same time as the teak deck so you can gauge if the wood has worn down any.