I have had issues truing the tires but they can still be trued. They do take more time to true and you have to keep an eye on them. I still use lighter fluid on them with no issues.
I am using a Hudy truer with a diamond drum. I clean the drum with a Wright Way drum cleaner a couple of times during the truing process to make sure I am removing as much of the tire residue as possible.
The big question here is – what is the solution? Are people requesting to run NSR or someother tires?