Smoothing and repainting a very uneven painted wooden surface

Hiya the short but sweet answer is a 2 pack filler mate, best brand I've found is tetrion powerfil, this comes with the hardener included, it dries in minutes in the right conditions, cutting down waiting time, so by the time you've filled where needed it will be ready to sand, apply 2 coats of primer, then finish off with the top coat of your choosing, hopes this helps all the best 👍

good answer Mr evans follow that.

As above but i prefer the ronseal white one. They are all really 2 pack fillers that were developed for the car body work trade. So never any problems with adhesion, and with enough patience you would be surprised how great a finish you can achieve

the one draw back to using 2 pack filler is it’s difficult to use if u are not used to it do to adding harder and it going off very quick in turn its very hard to sand unless u use electric sander me personaly would use toupret filler sand the wood paint with a water based primer then fill what needs to ie applying a new film of filler over the whole area then lightly sand re paint with primer then u will prob need another top up fill painting it in between fills with primer will highlight what needs filler and where