[quote="samk"]Help with painting over woodstain. Have tried primer, undercoat x 2, gloss x 2. Stain still comes through. Want to keep the door.[/quote] have you tried a water based primer ,seems the oil in the paint is activating the stain
Use zinsser B-I-N it's shellac based,unbeatable for what you intend doing.
Apply 2 coats to be sure of a good seal and leave for 5-7 days for best results,after that time,you can apply and water based or oil based coatings.