Well, thanks for the responses. I’ve been all over the net looking for a source to support the idea there’s a federal law against plugging highway tires. I’m convinced now there are none. Maybe it’s illegal in certain states. Nothing in my state of PA’s vehicle code I know of & certainly OK per PA safety inspection rules. I’ve heard it’s illegal in Maine, but haven’t found a source for that.
I now realize asemaster is right about the TREAD Act not applying to tire repair.
Maybe some of the tire experts could chime in. If not, thaen thanks to those who have. KS