NEW PRO-BLEND KARTING TIRE SOFTENER, GO KART INSIDE TIRE TREATMENT, HOT LAP 3... Gallon Bottle of Pro-Blend Hot Lap 3 Inside Tire Softener (Pro-Blend Part #3030HLG). Good for use on dirt and asphalt tires. Inside tire treatment is designed to accent Pro-Blend's outside tire treatments Inside tire treatment is not undetectable. The inside prep allows you to drop the durometer reading of the tire without prepping aggressively from the outside. Reduces lap times 2-5 tenths.