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mcJ78
Howard
Airhead
The wood you're looking at is basically denatured. Very often it's only slightly softer than normal and doesn't always have a lot of rot. It's easy enough to handle if you are overpainting but clear varnish is a bit more of a challenge.
The earlier advice has been on point though, it might just need a little sanding and coat it with some sort of exterior varnish. It's a job you need to do fairly regularly rather than try and find a forever solution.
A paint system applied properly, something like Dulux Weathershield will have an 8-10 year guarantee, longest lasting in gloss white, shortest in dark matt finishes. I use All-coat with a coat of cover stain as a primer. So far approaching 6 years without problem in some local jobs. Oil based Dulux weathershield jobs have got past 10 years now but are beginning to crack here and there, mostly on edges of cills.