[BitWielder1]

If shippers can safe fuel, they will. Hence the bulb in the front of most modern ships.
When it becomes cost effective to texture the hull, they will.
Until then, keeping barnacles off and corrosion down is more important.

[UCANSEE2]

The 'drag' on a hull comes from water 'sticking' to the surface.

Other things (barnacles and corrosion) add to it.

BUT , what if you had something the keeps anything from sticking to the surface , especially water ?

Well, it's already available. Think of what it would do to minimize the noise of PROPS on SUBMARINES and eliminate CAVITATION. Think of the added speed it would give to any kind of boat.

The product is called NEVERWET. Watch this video.

NeverWet Arrives - Hands-On Product Demonstration

NEVERWET WEBSITE