Paint for external soffits

[cliffords]

We have a 1980 Bungalow with wooden soffits . Four years ago I rubbed down some areas and did local repainting where the paint had lifted .
I used Zinsser products after recommendation , an undercoat and a top coat .
Two years later some more had lifted so I repeated with another Zinsser product claiming to be a one coat .

Its failed again now after jet washing the gutters and soffits I need to do various areas again .
The wood is not rotten and I sand back to solid paint best I can .

Can you recommend another product that might beat two years .

Up side is as its bungalow, and I am tall , its all off a low platform, no ladders.

[Orchid1]

Sadolin Superdec Wood protection.

[megaphone]

I'd just get it replaced or covered in plastic.

[CMTMB]

IME whatever paint you use it'll require touching up every year or two.

[wolfracesonic]

The Sadolin Superdec is good stuff (so is Zinnsser tbh), I did the balustrading on my decking 3 years ago and it doesn’t seem to have deteriorated much.
I’ve got to say though, soffits are quite sheltered so I’m surprised any paint has failed there; 80s build suggests 6mm ply or even asbestos!