Skins (Camouflage, Decals, Flags) in the game Navy War are purchased once and permanent. Skins are purchased separately for each ship, and after purchase they can be removed / put back on.
Camouflage — Increases the Chance to Absorb damage from shells by a certain %. The higher the Chance to Absorb, the more often the ship can reduce the damage received from shells.
Decal — reduces the Spread of shells by a certain % (depending on the selected decal). The smaller the Spread, the more accurately the shells hit the target.
Flag — increases the Acceleration of the ship by a certain % (depending on the selected flag). The higher the Acceleration, the faster the ship gains and resets speed when moving and turning.