Repainting ancient sash window frames

[CSIblonde]

Would anyone advise me on Victorian sash window frames that have flaked badly sin to bare wood. I've sanded off the flakes & it's bare wood underneath,but there are large stubborn areas of paint left that won't come off , so the surface is v v uneven. Do I use bog standard filler to even out the surface first? And can I use all in one primer & gloss? You Tube videos haven't been much help it's all wooden frames that look pristine already.

Strip off the remaining paint using a heat gun or a chemical stripper then sand and prime and paint.

Sorry, also fill where needed using wood filler before sanding, priming and painting.

Heat gun, wood hardener, wood filler, sand, prime, paint.

It's an absolute ballache.

Yes heat gun is the way.

I stripped a sash bay with 5 separate sections of sash. Was a whole week of standing there with the heat gun but it was worth it. Just bear in mind you may be burning off lead based paint and to ventilate well while you’re doing it.

but don't get too close to the glass or you will need to add glazing to your skill set!

Always use 2 part filler, not polyfilla or water based ones.

If you want to make the investment I used a 2 part expoxy wood filler in cartridge form from a company called Timbabuild. They say it lasts over 50 years. And 3 years later it looks perfect.
Used it where a splice repair should of really be done.
Was a lot easier to use and sand than standard wood filler