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Thread: Cracked Plexi

  1. #1
    Master
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    Cracked Plexi

    I have a small crack in a plexi crystal which has a tension ring fitted. My question is rather tha fork out for a new armourlite crystal, can the crack be repaired? If so, what can I use.

    Thanks.

  2. #2
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    Replacement is easier, but if you get super glue and carefully put it in the crack to fill up to the surface, then sand it back flat and polish it up. Superglue has a similar refractive index to perspex and isn't easily visible if done properly.

    Do this with the glass out of the watch and completely clean so nothing else is in the crack.

  3. #3
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    Quote Originally Posted by me32dc View Post
    Replacement is easier, but if you get super glue and carefully put it in the crack to fill up to the surface, then sand it back flat and polish it up. Superglue has a similar refractive index to perspex and isn't easily visible if done properly.

    Do this with the glass out of the watch and completely clean so nothing else is in the crack.

    Ta very much. I will give that a go.

  4. #4
    Grand Master
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    Every day's a schoolday.....I wouldn't have thought of trying the superglue trick.

    However, if the crystal has to come out surely it makes sense to fit a new one?

    Paul

  5. #5
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    Armoured glass.

    A new lens/ glass won't cost much, so easy to get someone to do it, or have a go yourself.
    Go for it.

  6. #6
    Craftsman Webwatchmaker's Avatar
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    Definitely wiser to replace. These glasses shrink at the edges over time and once out don't seal properly again.

    Sent from my SM-G900F using TZ-UK mobile app

  7. #7
    Craftsman Man of Kent's Avatar
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    I concur. New crystal will be a few pounds at most. Fitting is a doddle.

  8. #8
    Grand Master
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    Quote Originally Posted by Man of Kent View Post
    I concur. New crystal will be a few pounds at most. Fitting is a doddle.
    Disagree! If you find it so easy I must be doing something wrong when I fit them.

    Sometimes they just don`t want to go in. Even after measuring the original carefully you can end up buying three. They're sold in increments of 0.1mm, I`ve ended up buying the 'correct size' the next one up and the next one down. Find the one that fits snugly. That's why it's easier buying the genuine manufacturers item, but even then I`ve known them be v. tight. Ideally, you keep a stock and you always have the right one to hand, but on my scale it isn`t worth it. Sods law states that you very rarely have the one you want.

    Fitting plain acrylic crystals is a whole lot easier, the tension ring crystals can be a challenge. If it goes in using thumb pressure only it's not tight enough and it'll probably leak; Brenden's comment is correct, they do shrink slightly when they're old.

    Paul

  9. #9
    Master
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    The super glue trick did not work at all. If fact it made it worse. I have since ordered a couple of new one's.

  10. #10
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    Quote Originally Posted by MADDOG View Post
    The super glue trick did not work at all. If fact it made it worse. I have since ordered a couple of new one's.
    I have used it before on irreplaceable ones that can't be custom made as very unusual shapes, I would always replace if possible.

    Did you test the glue first? Not all superglues are the same and will have varying RI's and curing finishes.

    Do you have a press for fitting the dome?

  11. #11
    Craftsman Webwatchmaker's Avatar
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    A press is essential

    Sent from my SM-G900F using TZ-UK mobile app

  12. #12
    Master
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    New acrylic arrived and sitting very pretty in the Roamer. Thanks for all the suggestions.

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