Painting a Conservatory

[la123la]

I have my conservatory painted professionally every 5 years, it is due this year which will be the third time, however, every year the paint on the bottom half blisters and peels and I have to repaint this area myself to ensure rain and bad weather does not damage the wood. I don't know why this happens as the correct paint is used which allows the wood to breathe. Should some kind of undercoat/primer be used? I can't remember what the weather was like when it was last painted but if it was wet or damp could this have made a difference?
Thank you

[stoneyboy]

la123la,
The failure of the paint on the lower parts is probably due to the end grain of the timbers not being sealed when the conservatory was erected.
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