I need to paint our (communal) front door. A neighbour has rubbed it down, levelled it with filler then abandoned the job. My plan is to take 'direct action' and go ahead and paint it. I therefore cannot really find out what he has done.
It's an external door exposed to sun and rain (sometimes at the same time) so needs maximum protection. I am tempted to use aluminium primer (which I have used in the past) but I see it is recommended more for resinous woods. I am dubious about any water based primer outside and with an unknown base. I don't mind if it's over-kill. Can I go ahead and use aluminium primer or am I making a mistake?