Cover must be custom
Some kind of protection must be provided if you want the wood to look good for a long time. I started with oil but it was only a month until it had to be reapplied. I used polyurethane and then spar varnish but it only lasted about 2 years even with sitting in a building for 5 months a year.
After conferring with workers of the wooden boat shop at the Chesapeake Bay Maritime Museum in St. Michael, MD on the best marine wood finish, I redid my teak for the 5th time in the last 20 years. Oh, they said Flagship Spar Vanish minimum 13 coats! I painted 10 coats with light sanding between each coat two years ago and the wood looks as good as the day I did it but, after all the work of 10 coats I then covered everything with Sumbrella. This past fall I added an additional 6 coats with sanding between, looks like the wood is embedded in glass, wow!
I used the snaps for the raised cabin top cover to attach this new self made cover, only had to add a couple snaps to go around the mast. I made the hem on the sides 3 layers thick and 3 inches wide to hang down below the snaps to cover the window wood eyebrow trim. The raised cabin top has a companion way extension in the cover that snaps to the companion way exterior wood trim and then a zipper in the center is used to enter the enclosed cabin. I extended this new cover down over the companion way hatch boards and used the snaps already in place to hold it, again I made extra large hem so the cover extended out over the companion way trim to keep it somewhat protected from the sun and rain.
Now, I will tell you that this cover is not on the open market, so you will have to have a shop make it to fit if you do not have a family member with a sewing machine. I will also say if you want your bright work to look like new with a little touch up every couple years then the cost will be worth it because right now my wood looks like the day I varnished it a couple years ago.
The Flagship varnish cost $45 a quart and with 16 coats one quart was not enough so, adding all the time to mask, sand and apply each coat of varnish, maybe the full cost to have a custom cover made might be a major savings in the future.