The manufacturer says:
2C stands for 2-component.
Part A is the oil, and
Part B is an accelerant and hardener.
This is Part A where is Part B?
(Obviously Part A is worthless without Part B.)
Likely sold separately but just not here on Woot.
Most items on Clearance are from Amazon overstock and aged inventory so we don’t have a lot of information on them.
Here it is on Amazon:
https://www.amazon.com/Rubio-Monocoat-Plus-Sample-100ml/dp/B07QFG754L