Which substance is not recommended by IICL for wooden floor repairs?

The use of wood filler is not recommended by the IICL for wooden floor repairs because it does not provide the necessary structural integrity and durability required in the context of container flooring. Wood fillers are typically used for cosmetic repairs, filling in small cracks, holes, or blemishes on wood surfaces. However, they lack the strength needed to restore the performance and longevity of wooden flooring that endures heavy loads and environmental changes.

On the other hand, substances like polyurethane, epoxy resin, and wood glue are recommended for repairs because they offer stronger adhesion, flexibility, and resilience. Polyurethane can provide a tough, moisture-resistant seal that helps protect wooden floors. Epoxy resin is a strong adhesive that can bond well to wood and fill larger voids while also ensuring long-lasting repairs. Wood glue, when used appropriately, can create a strong bond between wooden pieces, making it suitable for structural repairs. These characteristics align well with the demands of container flooring, thereby supporting its effectiveness and safety.