Many will also recommend the Dulux weather shield system, but it’s a more prescriptive 3 stage process, the superdec is very forgiving 2 or 3 costs depending on what you’re painting onto.I’ve not hear great success with Sikkens in the past (Satura). It started to lift and peel from timber in a few years.
Currently redoing a ton of windows of various timber, age and states of covering - using Sadolin Superdec.