Internal doors leaching oil

[clutternut]

Hi all
I'd very much appreciate your advice on how to prepare my internal doors for painting. They are typical 1980's smooth wood veneer finish. About 10 years ago I oiled them - with teak oil, if I remember rightly - to bring up the shine. This worked OK, but now I'm having a nightmare trying to prep them for an eggshell finish!

Washing down: I've washed them down about 6 times with strong solutions of sugar soap, but they're still leaching a dark brown stain onto my cloth. The shine is gradually getting cut back, though they're currently a horrid mix of shiny and matt. Do I just keep going with the sugar soap until the colour stops seeping out?

Getting a decent key: What should I use to sand them ready for painting? A friend suggested fine wire wool, which I've spot-tried but I'm not sure if it's the right approach. Should I be using wet & dry or a fine sandpaper?

Sealing: I've read lots of positive comments on this forum about Zinsser Bin for sealing in oil-based stains, but I'm worried about making a gloopy mess of it, thus waving goodbye to my hope of super-smooth eggshell-finished doors. What would you recommend, and should it be applied with a roller or brush?

Sorry for so many questions, but I'm at a loss with this. Would very much appreciate your help!

 

[joe-90]

Personally I'd dump them but if you want to proceed your best bet is to wipe them down with white spirit and not sugar soap. Then use an oil based primer then eggshell.

 

[LJW61]

Rub them with a coarse toweling rag soaked in celulose thinners then use an oil-based primer & undercoat befor finishing with eggshell(again oil-based)..

 

[clutternut]

Thanks so much for taking the time to help, and for these very useful tips. I'll try both methods for clearing the oil and will use oil-based primer & paint. I feel a lot more confident about getting this job done properly - thanks again!