Direct answer: While you are driving the boat, press Z or C to change its skin. The skin will not change if you are only standing on the boat or are not controlling it.
How to change the boat skin
- Enter the driver's position and begin controlling the boat.
- Press Z or C on the keyboard.
- Continue pressing either key to cycle through the boat skins you own.
If nothing changes, confirm that you are actually driving. Standing on the deck is not enough to activate the skin-switching controls. These instructions cover the listed keyboard input; controller and remapped controls can use different prompts.
Where to get boat skins
Boat skins can appear when boss drops or Drip creatures are submitted to the Reel of Fortune. They are chance-based rewards that can appear alongside other equipment and weapon skins.
The listed boat skins are:
- Brown
- Red and White Stripes
- Rainbow
Obtaining one of these rewards adds another appearance that can be selected while driving the boat.