If you’re tackling tricky painting jobs where stains keep bleeding through, Zinsser BIN Primer is a game-changer. In this video, we put it to the test on a 20-year-old pine staircase that resisted other primers, and show how BIN’s shellac-based formula delivers unbeatable stain blocking and adhesion. You’ll learn why it outperforms other options like Zinsser Cover Stain and Bullseye 123, plus get practical tips on prep, application, and drying times to achieve a flawless finish. Perfect for DIYers new to Zinsser BIN, this guide shows you how to get professional results on problem surfaces without endless coats of paint.