油性

1. Origins, structure, and basic meaning

• Structure: 油性 (ゆせい) describes an oil-based or water-resistant property. 油性ペン and 油性の塗料 show a compound and an attributive phrase.
• Basic usage: An oil-based marker writes on cardboard; oil-based paint resists water after drying.

2. Common pitfalls and similar expressions

• Writing-tool category and water-resistant paint property
  • The first construction is a conventional product name; the second uses の to modify material type. Water resistance is directly supported only for the paint context.