That said, there are downsides. For instance, is MDF waterproof? Definitely not. It absorbs water easily and when it does, the fibers break down. Another problem is that while it is dimensionally ...

Protecting under-sink cabinets is a must if yours are made from a material like hardwood or MDF that is easily ruined ... your cabinets without noticing. Waterproofing is one of the best ways ...