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I have a cracked corner of fascia where two fiber cement boards meet. How would I go about fixing this? I tried "DAP Platinum Patch" spackling compound, just to find out that it's supposed to only cover minor cracks up to 1/8" deep.

I feel like this corner needs to be filled with something. What should I use?

enter image description here

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    Commenting because I don't know if this idea is bunkum: Try auto body filler, like "Bondo". Apply in layers, perhaps, per the instructions, but build out until the surface is proud of the facia faces, then sand flush, prime & paint. The stuff is good for outside work, since it's designed for cars. The existing pieces need to be dust- and dirt-free, so the filler has something solid to bind to.
    – Triplefault
    Mar 16, 2022 at 16:00
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    Remove broken trim. Replace with new pieces.
    – FreeMan
    Mar 16, 2022 at 16:00
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    Do you know why it cracked?
    – JACK
    Mar 16, 2022 at 16:29
  • @JACK I think previous owner may have damaged it when installing the gazebo, you can see one of the roof support rods sticking in that direction. It is not degrading further.
    – hyankov
    Mar 16, 2022 at 16:34

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If you want a crisp corner, treat it like a plastering [spackle?] task but using exterior-grade filler.

Square off the corner by using a piece of exterior angle-bead held in place by a couple of dollops of your filler [knock it back a little if you need, to bed it properly], then smooth finish afterwards, leaving the metal edge as your visible corner. Paint as desired.
Done like this it will even be slightly resistant to a little movement afterwards [but not a lot].

enter image description here

Examples of various bead types from UK trade store. I don't know if the US uses the same naming conventions.

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  • Ah, sounds like a great idea!
    – hyankov
    Mar 17, 2022 at 12:38

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