At work we print hundreds of colour labels a day and the most cost effective way for us is using a good quality laser.
This is only viable if you can batch print rather than print single labels on demand, in which case a dedicated label printer is the way to go.

For custom self printed colour labels to be solvent resistant is a very,very big ask. I've never seen a laser or ink jet label that would survive contact with solvents like thinners,mekp etc.
It may be worth looking into 'chemical resistant over laminates' that are placed over the label to protect it. Which are basically a clear (polyester?) protective label that is slightly larger than the printed label.
I don't have any experience of those I'm afraid, hopefully someone else might.