When we bought our boat the finish of the interior teak wasn't great. 30+ years of previous owners hanging various things had left numerous holes throughout. We first removed all cabinet doors, pocket (sliding) doors and the hanging locker door.
Any nail/screw holes or imperfections were filled with famwood wood filler then everything was sanded with a random orbit sander (where able) or by hand with 80 grit paper followed by 120 and then 220 grit paper. After vacuuming several times and then wiping down with acetone we began applying Watco teak oil (available at most hardware stores or even Walmart). The photo below shows the progression from the original stain then sanded bare to only one coat of teak oil.
Here is a closeup after applying 5 coats of the Watco teak oil.
The teak oil was applied with a chipping brush waiting 30 minutes between coats and instead of wiping after every coat wiping wasn't done until after the 5th coat. We are very happy with the results.
Any nail/screw holes or imperfections were filled with famwood wood filler then everything was sanded with a random orbit sander (where able) or by hand with 80 grit paper followed by 120 and then 220 grit paper. After vacuuming several times and then wiping down with acetone we began applying Watco teak oil (available at most hardware stores or even Walmart). The photo below shows the progression from the original stain then sanded bare to only one coat of teak oil.
Here is a closeup after applying 5 coats of the Watco teak oil.
The teak oil was applied with a chipping brush waiting 30 minutes between coats and instead of wiping after every coat wiping wasn't done until after the 5th coat. We are very happy with the results.