As a result of an unwise storage choice, one of my hulls has a good deal of hardened tree sap on it. I'm in the process of getting my H-17 ready for the water again (after more than four years on land) and I'd like to figure out how to get rid of the sap. The greatest accumulation is on the side of the hull below the waterline.



Choices that come to mind are:

* Buff sanding and then repairing the gelcoat

* Chipping/chiseling and then repairing the gelcoat

* Some sort of chemical/enzyme solution



Any suggestions? I'm already going to be doing some work to repair delamination and various chips and scrapes from over the years, so I'm prepared to spend a good deal of time in the garage over the next couple of weeks in any event.