• Flaking undercoat and Galvafroid on up'n'over garage door

    From Andrew@21:1/5 to All on Wed Jun 4 19:27:50 2025
    A few years ago I stripped my metal galvanised garage door
    with a heat gun and repainted it with a coat of Galvafroid
    followed by grey undercoat.

    At this point the door was about 40 years old (house built
    1976) and this door had been painted twice since the original
    builders painted it, firstly by the previous owner who slapped
    on another coat of black gloss paint which I stripped off to bare
    metal about 20 years ago. I also used galvanised primer plus
    undercoat plus gloss back then. It was fine for over 10 years
    until the paint started cracking along the creases and folds
    in the door.

    I then repeated full metal strip with Galvafroid but left it at
    the undercoat stage while doing other jobs (and dithering about
    demolishing the by now detached garage and having an extension).

    The extension plans have now been abandoned but I notice that
    the primer+undercoat has cracked and is flaking off in many
    places.

    I really don't want to strip it again. If I remove all the
    flaky/cracking bits and carefully feather the paint edges,
    what are chances of just touching in the bare galvanised
    spots with the correct primer, plus a new undercoat and
    gloss ?. Will this stop further flaking, or have I shot
    myself in the foot leaving it at undercoat for many years ?

    Andrew

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  • From The Natural Philosopher@21:1/5 to Andrew on Wed Jun 4 20:40:56 2025
    On 04/06/2025 19:27, Andrew wrote:
    A few years ago I stripped my metal galvanised garage door
    with a heat gun and repainted it with a coat of Galvafroid
    followed by grey undercoat.

    At this point the door was about 40 years old (house built
    1976) and this door had been painted twice since the original
    builders painted it, firstly by the previous owner who slapped
    on another coat of black gloss paint which I stripped off to bare
    metal about 20 years ago. I also used galvanised primer plus
    undercoat plus gloss back then. It was fine for over 10 years
    until the paint started cracking along the creases and folds
    in the door.

    I then repeated full metal strip with Galvafroid but left it at
    the undercoat stage while doing other jobs (and dithering about
    demolishing the by now detached garage and having an extension).

    The extension plans have now been abandoned but I notice that
    the primer+undercoat has cracked and is flaking off in many
    places.

    I really don't want to strip it again. If I remove all the
    flaky/cracking bits and carefully feather the paint edges,
    what are chances of just touching in the bare galvanised
    spots with the correct primer, plus a new undercoat and
    gloss ?. Will this stop further flaking, or have I shot
    myself in the foot leaving it at undercoat for many years ?

    Andrew

    My garage doors are similar. I just pressure wash the loose stuff off
    every twenty years and slap on whatever crap is currently available for 'exterior metalwork'
    I cant be arsed to make it a pukka job.


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