So I used Rust Check this year for the LS 430, and I'm happier with the results. The stuff is definitely thicker and drips less. My Lexus master tech had the car up on a hoist for the tire rotation and he commented about how thick and good whatever the stuff I used was. The holes drilled are unnoticeable and covered with OEM-looking black plugs. I don't believe this car had been rust proofed before (Rrocket owned it before me), and the underbody is absolutely spotless. Really looks like it's never seen a winter before.