undercoat for previously stained doors?

[Gatekeeper]

which undercoat would be suitable for painting over a door previously stained a mahogany colour; I hate the doors in our living room and want to paint them white to brighten the room but a test patch has shown the stain bleeding through the undercoat (wilko own)

cheers

hi, check out the Zinsser range. nothing gets through these primers!

www.zinsseruk.com/product-category/primers/

cheaper ones are available, but don't work as well.

brilliant; thank you