Want to know how to reseal your bulkhead?  We recommend following these steps: 

1) Clean the area with soap and water and let it dry  
2) Leave the old sealant in place unless it's pulling away from the boat or bulkhead  
3) Lay down a thin bead of sealant  
4) Smooth with a gloved finger

Wear protective gloves and don't be afraid to use plenty of sealant!  Lexel, 3M 5200, Sika-flex, Marine Goop (other marine grade sealants may also work) are available at most hardware stores.   There are many online videos, forums and websites that will help guide you through these repairs and procedures.  Your local dealer can be quite helpful in providing hands-on help and parts, as well!