I have drop boards made of cheap teak plywood. They really look good, but you can NEVER EVER sand off the varnish or the very thin teak veneer is just dead.
The boat came with two pair. The first I tried to sand and learned my lesson. I recovered by painting them white which works well enough.
The second I just started working on. I tried citristrip and a scraper to remove the varnish. This has worked amazingly well.
What I learned:
1) It takes two or three tries. I coated it thickly, left for a couple hours, scraped. Reapply. Finished cleaning with a scrubby from my kitchen.
2) When finished, I did a lot better when I thoroughly cleaned and scrubbed with mineral spirits to really get it all off well. When I cleaned three times with a clean scrubby I did best. Very light fine sanding when done.
I probably should have asked first, but does anyone else have experience, advice, or recommendations for refinishing veneer? There is more to do in the next couple years. I am NOT great at varnish, nor do I ever wish to be. I want to be able to protect my wood and do an adequate job with the least effort and with the longest durability.
PS: Yes, I'm a guy, so I washed the scrubby and put it back in my kitchen.
: San Diego