I would be grateful for your advice. I am about to paint my front door (wood) and was wondering what good quality primer to use. I am aware of the dulux and the farrow and Ball varieties but they are a bit overpriced. This one is highly rated by Screwfix customers and isn't as expensive http://www.screwfix.com/p/acrylic-primer-undercoat-white-2-5ltr/64719 Any advice welcome