3 worn out keris

[Mickey the Finn]

This brings to mind images of several different kinds, none of which necessarily are the type of plastic sleeve you're talking about. I'd hazard a guess that something like the heat-shrink tubing sometimes used on electrical leads, or chains exposed to the elements, might be close to what you mean.
Minyak cendana, mawar, dan melati, as per Mpu Djeno's instructions, mixed with mineral oil is what I've been using. Since the Mpu did not specify any ratio, I'm still working on it, and leaning toward more melati, less mawar.
On a related note: the minyak known as "Seribu Bunga"...is it anything like the style of perfume called a "flower bomb"? Does anyone have any specific information about the formulation of "Seribu Bunga", or it's dominant floral notes? Or is it just a catchall term for a "flower bomb"?