| Experimental classification/Oil types | Number of applications | ||
| Untreated | 0 | ||
| Natural oil | Non-drying oil | Olive oil | 1 - 3 times |
| Semi-drying oil | Bean oil | 1 - 3 times | |
| Drying oil | Linseed oil | 1 - 3 times | |
| Perilla oil | 1 - 3 times | ||
| Commercial water repellents | 1 - 3 times | ||