Tough But Flexible Seal – This shoe glue for boots is rubber toughened and waterproof. Our boot glue stays flexible after it dries so the sole won’t break apart again when you’re walking. Boot Glue – Quick Dry Boot Repair Formula Works in Seconds – Tough but Flexible Glue Seal – Waterproof Boot Heel Fix Works on Shoe Heel Repair, Thick Sole Boots, Sneakers, and More.