Bud you can seal your stringers when you set the deck. Mix a thickened epoxy or buy the thickened caulk tubes like I did and when you set the deck just epoxy it to the stringers at the same time sealing your stringer work in the process. I did it to my boats both the Blazer & Champion.

Six10 Thickened Epoxy Adhesive | WEST SYSTEM Epoxy