为了减少散热，在活塞顶、缸盖喷涂了氧化镐涂层，同时在副燃室设计了空气缝隙。

The oxide-coated zirconium of the chambers at the piston and cylinder head, the design of air gap on the auxiliary chamber are applied to lower heat rejection.

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WR 9138可以直接喷涂在皮革上，也可用于底涂、顶涂及水性光亮剂等配方中，防水能力与其使用量成比例。

WR 9138 is used in the finishing after it is diluted with water. It can give good water-proof properties.

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