The Okinawan climate is very hard on boats. The worst culprit is intense sun that dries out and bleaches all the woodwork. At the start of the project I gave all the wood 6 coats of wood treatment stuff and 4 coats of yacht varnish. I thought that would set me up for a couple of years. Not so.

The top 2 slats normally face inwards and are unharmed The bottom slat is nearly white again after 6 months
The other problem is very high humility. This causes rust on any iron/steel fittings and mildew on any surface.
I forgot to mention that the mighty Yanmar is now bolted in place and fully wired up! Just needs diesel and a battery.
I take great care on this job. I tape everything off to avoid any sloppy smears or dribbles. I have nearly finished when, to my dismay, I find there is paint everywhere!
The loose ends of my OIST Graduation bracelet have been dangling into the paint and dribbling it all over. No more hippy stuff for me.
I will be leaving the boat for 4 months. I can see that on my return, I will have to do a major wood repaint and mildew clean.
Take local advice(s), but many gurus say teak is best left untreated. The grey surface is the best protection. KBO.
Had to look up KBO. Very good, I will use it a lot. I leave for San Francisco Thursday morning for 4 months. Boat 98% finished! Did not quite make it.