Brown varnish painted wood. Sobs. Lots of it...

[sleepdodger]

I have been on this section alot over last new days coinciding with buying an old house this week!
You've been be helpful so far...
I've been researching best way to paint over wood which ha been stained that really really dark brown colour
The whole house is covered in it
What methods hve you had success with
I fear for all my sanding priming and undercoats that I'd still get an orangey ghost stain coming through
Are tgere any specialist primers you have tried
Google offers lots of expensive chemicals which I'd like to avoid where possible as I have a baby ds
Thanks!