In article . com,
says...
Hi, we have a new softwood gate which will obviously need some form of
protection. We'd quite to maintain its current colour - can anyone
recommend a "clear" ish paint on sealer/protector and offer any advise
how to stop the gate falling to bits within 5 years.

I'd give it a good soaking with clear timber preservative, then finish
with a couple of coats of UV-stabilised varnish (gloss or satin).
Revarnish every 2-3 years.