"Generally it is not the paint that deteriorates, it is the bad preparation allowing raised bumps or crevices, cracks or holes which allows debris to accumulate. Upon absorption of water, in conjunction with temperature changes creates the perfect environment for damage to occur.
Answered on 19th Jul 2019 - Member since Jul 2019 - report
If you can when painting with high quality oil based paints, take the door off if possible, keep away from breezes so the whole painted face of the door dries at the same pace.
Paint very thin coats, not thick coats. This builds up the integral strength of the paint
When painting beach chalets at bulverhythe, st leonards on sea, after undercoating i applied coastal protection paint, expensive but very effective.
If you are unable to take the door off, try applying a thin coat of Vaseline around the frame/ draught strips so they dont adhere to the newly fresh painted door. That in reality takes a couple of days too really dry."