Broken Rubber Boat is the IC2 Experimental item that a Rubber Boat turns into after enough collision damage, repairable with one Rubber on a crafting table.
Guide
After your Rubber Boat collides with shore or a mob, look for the floating Broken Rubber Boat item and pick it up before it despawns.
Open your inventory and confirm you have at least one Rubber, harvested from sticky resin on rubber trees and processed in an Extractor or a furnace.
Right-click any standard 3x3 crafting table; the Rubber Boat repair recipe is a shapeless IC2 recipe and does not require a special machine.
Place the Broken Rubber Boat and one Rubber in any two slots of the crafting grid to produce a fully repaired Rubber Boat in the output.
Take the Rubber Boat, right-click a water block to place it, then mount it like a vanilla boat to continue traveling.
The Broken Rubber Boat repair recipe is available in Industrial Craft 2 Experimental on Minecraft 1.7.10, 1.10.2, and 1.12.2.
Enough collision damage with shore, solid blocks, or mobs converts the Rubber Boat into the Broken Rubber Boat item instead of fully destroying it.
Place one Broken Rubber Boat and one Rubber in any two slots of a standard crafting table; the shapeless recipe outputs one Rubber Boat.
A vanilla boat shatters into sticks and planks on impact, while the IC2 Rubber Boat survives as a single item that you repair with only one Rubber.
Use 5 Rubber in a vanilla boat shape: three across the bottom row and one on each side of the middle row of a 3x3 crafting grid.
Broken Rubber Boat ships with Industrial Craft 2 Experimental for Minecraft 1.7.10, 1.10.2, and 1.12.2.
No, the Rubber Boat is a vehicle item and does not accept enchantments in vanilla Industrial Craft 2 Experimental.