I used Coelan in 2010
When applied it is truly wonderful in appearance. I applied it because I wanted a leak proof finish. I used a belt sander, 120 grit with the grain and removed all the previous coating. I think it was Cetol.
I had about 200 square feet of teak, composed a of fly bridge deck, covered by a full enclosed bimini and a cabin deck open to the elements. I do cover the whole boat with a Lohman cover from October to March or April.
The good news. After 6 years of use it has not leaked. And except for one corner the covering has not lifted or been penetrated. On the fly bridge, under the bimini the deck looks brand new. It has that glossy plastic coating look.
The bad news.
Its expensive.
I can be slippery when wet.
Application is very difficult in that there can be absolutely no moisture when applying it. And by no moisture I mean you have to where rags around your wrists and forehead so your sweat does not drop on the deck. The fumes are really toxic. It killed every spider on board. You better wear a respirator with an organic filter. Because you have to have the deck covered to prevent against rain and dew, the fumes will be concentrated.
But the biggest disappointment are the mold spots that appear under the coating. I think they are mold spots. They are tiny black specs. The actual coating 'breaths' so when the coating gets wet the caulking lines will fog up. When it drys they will become black again.
Aside from the little black specs. I have been pleased with the covering. There has been no water integration.