I'm stripped my front door back to the wood and and have a tin of Valspar paint I want to paint it with. Because the Valspar is water-based apparently I need to use a water-based undercoat/wood primer. I have a tin of "Dulux Primer and Undercoat for Wood - interior and exterior" which I'm assuming would be suitable. Can anyone confirm this is the right undercoat to use? And if not, can you recommened one. I really don't want to have to strip another coat of paint off it! Thanks.