Beautiful style outside, lasting protection inside. Protect your cabinets from minor spills and leaks under the sink with the CoreGuard® Sink Base. Made of an engineered polymer that resists damage and stains, the CoreGuard® Sink Base is built to last and easy to clean so it stays beautiful for as long as you own it. Lifetime Limited Warranty. Sloped Floor - Directs spills forward for easy detection. Ribbed Floor - Keeps stored items dry. Engineered Polymer - Floor and sides provide strength, resist stains and are easy to clean.