I agree with Ian that Aglaia is kinder to your timber as it allows the wood to breathe. I'll be using that on the windows, etc. Womersley's agreed to give a discount for a bulk order.
I wonder why the F n B exterior eggshell failed on Ian's house though - here it is on my chicken shed nearly one year on and no probs at all. Also, it went on top of old Cresote which I'm sure isn't recommended.