Dale Earnhardt Jr.'s 88 car had the fastest speed of any car early during his practice session, but moments later he crashed into the wall and damaged the right side of his car.
Earnhardt was forced to go to his practice car, and he said the PJ1 substance applied to the high line of the track was the reason he wrecked.
Related: Dale Earnhardt Jr. leaving practice in a medical cart was just the start of his bad luck
The substance is supposed to enhance grip, but Earnhardt told NBC Sports Network after the practice that it actually had a negative affect on him.
"I got up into that stuff they sprayed down and it just shot up into the wall," Earnhardt said. "We were out there running laps and got the rights (tires) into that stuff and the car just went into the fence, like it blew a right front tire.
"I think I'm fine. The car is junk and it was actually driving pretty good, but the backup will be just as good. Just disappointing, man. That stuff out there on the track, it ain't good right now. I wouldn't touch it.
"I don't even know why they sprayed it down because we run this race in the daytime. It ain't like we needed any help to get the top working in. That was more to help this place at night. If you can't even run in it without plowing into the fence, what good is it."
Caught the fence in practice. I feel ok. Backup car will be fine. The track sprayed ?track grip? in upper grooves and it?s slick as oil. ??
— Dale Earnhardt Jr. (@DaleJr) October 6, 2017
Brad Keselowski also made contact with the wall, but he wasn't forced to move to the backup car.
It's worth monitoring whether more drivers have issues with the grip on the track during practice and on Sunday.
(h/t NBC Sports)