1) Goldenrod
2) Borestores for every gun
3) Once in the borestores, the plastic-coated racks will not damage the finish, unless you throw them in overhanded
4) The rechargeable silica gel dehumidifier is a good backup, specially at the bottom of the safe
5) periodic cleaning and wiping the gun with a gun oil will do them well...every six months or so.
6) If you must take guns on the boat, the waterproof floating case will give them a fighting chance
Goldenrod at:
Authentic Made in the USA Golden Rod Dehumidifiers In 4 Sizes
Borestores at:
Protective Gun Cases Silicone Treated - Bore Stores
Silica gel packs at Amazon:
Waterproof floating case at: