General Finishes Enduro® line has two physical primers, White and Deep Base Undercoat. General Finishes also offers Stain Blocker, a chemical primer. Every year, General Finishes formulation experts source the world for the best materials, and if they pass our scrutiny, they will show up in the can that arrives at your door. RESULTS you can TRUST every time. Enduro®, the gold standard for professional water-based finishes®.