Review on 1 QT Zinsser 271009 White Synthetic Shellac Primer | B-I-N Advanced - Pack of 1 by Daniel Jackson

Purchased specifically because everyone says you should use a shellac based primer to hide wood tannins when you're choking. There are wooden doors in my apartment where no matter what white paint I use (latex, oil, alkyd) the orange-red tannins of the wood ooze out. So I went through the process of stripping paint off the doors every 40+ years, letting them dry and then applying this product (again because the description says "Seals knots, sap and tannin") and let it dry/cure . . I have now applied 3 coats of oil paint and the orange still shines through. I will be using Kilz primer products as they have worked wonders for my kitchen cabinets but now again I need to find the right product to refresh my doors.