EXPERMINTATION on some scrap wood or a boat. That is a good way to do it when traveling in uncharted waters.
They say three coats is recommended and that is the same as I use. Out of the three one is bound to be correct. Or all three might be what is needed. We will never know till someone tries it.
Chuck.
Remember:
Amateurs built the Ark...... Professionals built the Titanic
Visit some fine paddlers at The Southern Paddler