Tuffleye Core is a special acrylic of the safest and highest quality that will cure (set) with a very narrow spectrum of visible blue light. Tuffleye has been formulated to begin curing within 2-5 seconds and completely harden in 10-20 seconds. It is packaged in light proof syringes. The syringe has a twist off cap that is easily replaced with the provided curved tip applicator if desired. This applicator tip can be trimmed like the tip of a caulking gun to best suit your needs.
Core is the hardest curing, whereas Finish still has a little flex, while Flex is the most pliable of the 3.