Plywood is made with layers of wood veneer, laid with the grains at approximately right angles and then glued together. The counter-posed grains and strong inter-sheet adhesive give this manufactured wood material its strength and resistance to warping. Plywood can be part of a wall, floor, ceiling, roof or even a boat. It can become scratched, cut, gouged, dented, blistered, separated or rotted. If damage to the plywood is not so extensive that it requires complete replacement, the damaged areas can be repaired.
Cut off blistered or peeled laminates from the main board, using the router. Cut off the blister or peel it completely back until the damaged laminate is flush with the main board. Sand the edge of the cut until the edge tapers onto the surface of the underlying laminate.