What else is added to the oils?
+1
There has to be another agent that you add to the oils; what is the other component on your homemade plug ins?
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I'm not sure if this is the post you're referring to, but you'll need to ask your question on the post to get an answer from the author.
https://www.hometalk.com/diy/decorate/rooms/homemade-oil-plug-in-refill-6975850
Homemade Oil Plug-In Refill
When you have a question about a project, ask it at the bottom of THAT post. We don't know what you were looking at. This forum is a place for DIY help on ALL projects.
You can also try the top left corner under SEARCH.
Here's another Hometalk discussion that might help: https://www.hometalk.com/diy/clean/q-how-to-mix-oil-for-plug-ins-43302989
How to mix oil for plug ins?
Please contact the person who posted the project you have a question about. Thanks!