Cedar windows newbie question

Hi
Just about to start freshening up my window frames, I did it about 18 months ago with sickens cetol hls
The windows are in the full glare of the Perth summer sun and it has started to peel off - is that expected or because of shoddy prep
I sanded the wood back to bare before starting
Anyway I don't want to make the same mistake, I am sanding back again, is there anything I should use on the wood once its sanded down - some sort of primer or cleaner
I see there is another product sickens have called supernatural and one called filter 7, are these worth using on top of a base coat of cetol?


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