Hi Keith
I generally use straight resin to seal the outside of the hull.
The Queen I traded had no spray rails or chine rails and is a very wet running boat.
It requires weight in the stern even with a 3S 5800mah Lipo in the stern.
It is going to get the rails and a repainted bottom after I finish the 3 projects I am working on.
With this isolation the workshop getting a good workout !!!
Keep safe
Harry Smith