Paint wont stick

[bikeit]

I have a mahogany window frame in the garage but the white gloss paint never stays on the bottom part of the window frame for any more that six months, i have tried several times stripping all the paint off back to bare wood, give it a good sanding applying a coat of primer followed by a coat of undercoat and finished off with a coat of gloss,
Any one here offer any advise on how i can solve this before winter comes

 

[ic1927]

Strip it back and prime with aluminium primer, give it two coats, slightly thin the first with white spirit, and then apply the undercoat and gloss.

 

[bikeit]

Hi mate i dont have any aluminium paint, anything else do? have some Zinnser 123 and some Bin.

 

[joe-90]

BIN might work. I think that the wood has probably been oiled at some point.