I think im going to try just sanding, cleaning, and teak oil. If im not happy with the results I may try the spar varnish or something but you are correct kahuna123 the varnish will need a very good uv protectant or it wont last long in Texas.
What grit sandpaper should I use on teak?
BTW that speargun looks great. It reminds me of a finish I have seen before on a beautiful wooden canoe.
I will take pictures and post them with the results. My first picture above was after I used a cheap home wood cleaner on it a few times. It looked ashy like the left side of 83mulligan's teak before I started.
I really appreciate the info so far. Thanks guys.