Had the same issue on our HR28. Added drains to the bottom of the lockers, and added TACO hatch tape to the underside of the lid. The tape is applied to 3 edges (the hinge side and the fore and aft ends), so that it is unsealed at the lip, allowing air to circulate and dry things out even when closed.
The hatch tape works OK, but the best thing is the drain, so that whatever does get in can find its way out. If your lockers can be drilled in a lower corner for drains, that's the best aid in this case. Ours drain to the cockpit footwell, which is a self-draining cockpit, so it all ends up going down the cockpit scuppers.
Paul Van Voorhees
Certified Tohatsu TLDI Technician
Mgr, Obersheimer Sails
Buffalo, NY USA