What is Re-Ply? Re-Ply is a part A and part B adhesive system that when pressed together forms an excellent bond. Formulated to be used on almost any paper or plastic substrate, and includes some metal applications. The A&B substrates may be separated and re-applied any number of times without losing their bond to each other. By catalyzing the 2 parts, they will become one permanent adhesive when applied to each other, face-to-face. The A&B systems can be provided in all the colors in the PMS color book.