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Old 05-05-2020, 11:38 PM   #1
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What can I seal crooked screw heads with?

While investigating a leak today, I found that several of the screws under the rubber 'strip' that is part of the rain gutter were installed crooked, leaving gaps between one side of the screw head and the hole behind it. Any water that gets to the space between the rubber strip and the screw/rail can (and has, sadly) cause a leak.There's butyl tape between the exterior siding and the back of the gutter rail, but no seal on the screws themselves.

I'm not sure the rubber is supposed to keep water out of that area - but its not.

I want to put some kind of sealant over the screw heads to ensure that water can't get past them.

What kind of sealant can I use here, knowing it can't be too bulky or the rubber strip won't seat in place over it...

Thanks!
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Old 05-06-2020, 12:11 AM   #2
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Can you remove the screws, 1 at a time, and then coat the threads heavily with a marine adhesive like 3M, 5200 and reinstall? Iíve used this product on all my boats for screws that are below the waterline.

https://www.lowes.com/pd/3M-3-oz-Whi...B&gclsrc=aw.ds
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Old 05-06-2020, 04:36 AM   #3
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Originally Posted by dalford View Post
Can you remove the screws, 1 at a time, and then coat the threads heavily with a marine adhesive like 3M, 5200 and reinstall? Iíve used this product on all my boats for screws that are below the waterline.



Rather than 5200 (almost unremovable without an appropriate solvent), I would recommend 4200. Iíve had lots of success on fittings and sealing above the waterline. Still difficult to remove, but way easier than 5200. And itís as flexible.
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Old 05-06-2020, 08:07 AM   #4
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You can back off the screw and put a strip of the butyl cauld tape around the threads and retighten
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Old 05-07-2020, 01:00 PM   #5
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Dicor or a good polyurethane sealant would work well. Easier to remove than the very good marine sealants. You may need to remove the screws later. Available in the roofing section of Home Depot or Lowe's. Most sealants in the paint dept. are not good for what you need.
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Old 05-07-2020, 01:11 PM   #6
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you can get non sag DICOR if its a vertical surface
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Old 05-07-2020, 08:03 PM   #7
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Maybe...

Quote:
Originally Posted by vocoder View Post
While investigating a leak today, I found that several of the screws under the rubber 'strip' that is part of the rain gutter were installed crooked, leaving gaps between one side of the screw head and the hole behind it. Any water that gets to the space between the rubber strip and the screw/rail can (and has, sadly) cause a leak.There's butyl tape between the exterior siding and the back of the gutter rail, but no seal on the screws themselves.

I'm not sure the rubber is supposed to keep water out of that area - but its not.

I want to put some kind of sealant over the screw heads to ensure that water can't get past them.

What kind of sealant can I use here, knowing it can't be too bulky or the rubber strip won't seat in place over it...

Thanks!
You know, you might just put a small faucet washer under the head of each crooked screw. They are thick enough that if you tighten the screw, you will get 360 degree compression.

I considered O-rings--they would work if you could get some that were thick enough.
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