Coating

Coating is a process in which a ship is coated with special resin from the Yarukiman Mangroves, enabling it to sail underwater and survive the crushing depths of the ocean, such as at the bottom of the Red Line.
==Overview==
A coating surrounds a ship in a bubble-like membrane which renders the ship less buoyant than the water around it, causing it to sink. Once the coating is applied, the only thing keeping the ship from sinking on the spot is a giant air bubble underneath. Once the crew wishes to depart, they drain the air from that bubble into the coating, causing it to inflate. This give the crew a supply of breathable air while they are underwater.
Coating is a very delicate procedure and must be done carefully, as any error in its application could compromise the bubble during the trip, causing the ship to be crushed by the pressure if it goes deep enough.
Coating is most often done to allow ships to bypass the Red Line, with a stop at Fish-Man Island, by allowing ships to sail through a gigantic, though tiny in the grand scheme of things, hole in the Red Line at the bottom of the ocean, 10,000 meters deep. Not even the most astute submarines are capable of such a dive. Without getting their ship coated, a crew would otherwise have to leave their vessel behind and get a new one on the other side after getting clearance from the World Government to pass over the Red Line.
Coating has so far been seen performed at the Sabaody Archipelago, where the Yarukiman Mangroves reside, and Fish-Man Island, where the roots of the Yarukiman Mangroves, and the Sunlight Tree Eve, can be found, and there is an as of yet unseen location on the New World side of the Red Line that allows for coating, which so far Whitebeard and Lola's crews have made use of offscreen.
==Coating Mechanics==
A coating mechanic (referred to as 'coating craftsman' in the FUNimation dub) is a person who coats a ship with the special resin that allows it to submerge. It is an expensive job and can take several days to complete. It is unknown how one goes about coating a ship, though Silvers Rayleigh was shown carrying several tools presumably related to the procedure, including oversized paint brushes.
Notably, Den is also a coating mechanic. He currently resides in Fish-Man Island.
On Fish-Man Island the use of the resin is taken one step further, and the ones who do this are called Bubble Craftsmen. They are responsible for the over water highways, and possibly for other unique structures involving the Yarukiman resin.
==Coated Ships==
===Usage===
Once a ship is coated, it loses the ability to stay afloat. Until the ship is ready to depart, an air-filled 'floating bag' is used to keep it on the surface. Once the ship is ready to leave, a valve connecting the bag to the resin bubble is opened, transferring the air into the bubble, causing it to cover the ship completely in order to provide breathable air for the crew.
The completed 'bubble roof' also serves to protect the entire ship from the extreme water pressure beneath the sea. The bubble is permeable, just like the bubbles of the Sabaody Archipelago, and will retain its integrity if objects pass through it, even underwater. This includes people and even cannonballs if necessary. However, if punctured in too many places at once, the bubble will pop. Also, the bubble will only protect against water. The ship would still be vulnerable to rocks and other obstacles.
In the anime, the bubble is shown to pop when a ship reaches the surface once more. Due to the coating being made out of Yarukiman Mangrove trees' resin, the bubble will burst when the ship emerges somewhere other than Sabaody Archipelago.
===Navigation===
Once the floating bag is removed, the ship starts to sink. However, it does not mean it will sink straight down. The ship is to be navigated by using the underwater Sea Currents as it would use the wind on the ocean surface. The safety precautions for sailing underwater are pretty much the same as for sailing on the surface.
Another way to navigate underwater is by using a sea creature to pull the ship. This is (relatively, depending on the crew's skill) much simpler as all that needs to be done is to capture a Sea Monster, tame it, and then put a leash on it which is attached to the ship. The sea monster is then used to steer and propel the ship into the depths. It has been said that the mark of a "pro undersea traveler" is to have a beast pulling the ship like that. The main fault with this technique is actually trying to conquer and tame a sea monster that is large and strong enough to pull the ship. However, once it is done, it is smooth sailing ahead, unless the sea monster in question gets spooked along the way.
Due to the bubble coating's nature, the ship can fire cannons to defend itself from sea monsters without compromising the barrier. However, the bubble's strength is not absolute. It can be compromised if the ship is bitten by a large animal (such as a Sea King), hitting rocks or a trench that cause the ship or mast to hit the bubble, or if sliced by a sword (such as Zoro did).
According to a sheet of instructions left by Rayleigh to Nami, 70% of all ships that headed for Fish-Man Island sank before reaching their destination.
Since coating a ship means it will automatically start sinking, if a coated ship is to ascend, extremely buoyant material is needed to do so, such as Kuuigosu wood chips, which must be let out gradually, while still attached to the ship. However, if a weight were attached to the ship outside of the bubble, this can cause the ship to sink down again. Otherwise, the principle of navigating a coated ship while ascending is the same as when descending.
====Coated Ships====
* Moby Dick and Whitebeard Pirates' four paddle ships
* All of Whitebeard's allies' ships
* Victoria Punk 
* Grudge Dolph 
* Liberal Hind 
* Stay Tune 
* Jewelry Margherita 
* Nostra Castello
* Hanjomaru 
* Thousand Sunny
* Unknown pirate galleon cut by Roronoa Zoro
* Numabou
* Gyro Pirates ship
* Flying Dutchman (limited)
* Noah
* Migohai Gaimika
==Flutter Kick Coating==
, is a type of coating used on people instead of ships. When a person is coated, the bubble forms a spherical shape around the person from the knees up, with a thin coating from the leg down.
Just like with Ship Coating, the people are able to withstand great pressure as long as they are in the bubble, but the air they have is limited. Flutter Kick Coating allows people to leave the ship, to do things like engage someone or something in combat. It was also shown that a small group of people can share a single bubble.
This coating can benefit Devil Fruit users by enabling them to move and fight underwater, although this may be somewhat compromised if the ability user's combat style requires a part of their body leaving the bubble, as Luffy's punch strength was decreased.
====Coated People====
* Monkey D. Luffy
* Roronoa Zoro
* Sanji
* Vander Decken IX
==Other Uses of Coating==
Strictly speaking, the following processes are not used for the same purpose as ship or Flutter Kick Coating, but still involve the use of the Yarukiman resin. So far two locations have adapted the unique properties of the resin for everyday needs, though mainly for transportation. These islands are Sabaody Archipelago and Fish-Man Island.
===Sabaody Archipelago===
====Housing====
The people of Sabaody use large bubbles, mainly when making hotels. By taking large bubbles, constructing solid surfaces within and furnish them, one can quickly create living quarters.
====Helmets====
The Celestial Dragons use bubbles as helmets to keep them from "breathing the same air" as the "commoners." It also allows them to touch their own face since it will not pop easily, allowing them to eat, or in some cases, pick their nose.
===Fish-Man Island===
====Overwater Highways====
The citizens of Fish-Man Island have constructed virtual highways of water that rise above the surface of the island. These are used by individual fish-men and merfolk as well as by larger modes of transportation such as fish buses. They are referred to as Water Roads in the FUNimation dubs.
====Inner Tubes====
Used mainly by merfolk with unsplit tails and fish, the inner tubes allow those who wear them to lift a little off the ground, with mobility supplied by the tailfin. With enough propulsion, the merfolk or fish are able to ascend even higher. These work well underwater as well, allowing humans riding on a fish to be dry and able to breathe.
====Bubbly Coral====
There is a portable device, a piece of coral, that can create bubbles, similar to Milky Dials, called Bubbly Coral. It is used mainly within Fish-Man Island by citizens and soldiers alike, for transportation purposes above dry land and air.
===Found in Both Islands===
====Bon Chari====
These bubble bicycles allow faster propulsion across surfaces by installing a special apparatus that propels a bubble across surfaces when using the bike pedals.
====Shopping Bags====
By simply attaching a solid bottom to a small bubble with a string attached to it, the bubbles will simply float, and one can put various items in it and drag it around.
==References==
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