I bought my nauticat 33 3 years ago. The inside was done with owatrol. By moisture there were many weathered spots. I have the whole inside of the boat with cleaning solvent, light polished and 2 times painted with Sikkens Cetol tgl satin plus, color teak (085 int. Woodcolours) Almost all places are nice now. Drying after the first lay took a long time.