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Old 18-05-2017, 20:32   #1
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Daylight through the hull

I was looking at a used boat the other day. When I stuck my head into the lockers, I could see spots of daylight showing through the fiberglass hull. Is this a big deal?





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Old 18-05-2017, 20:41   #2
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Re: Daylight through the hull

fiberGLASS. Its common to be able to see light through n FRP hull. It is still worth looking at the thin spots to see how well it was constructed.
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Old 18-05-2017, 22:09   #3
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Re: Daylight through the hull

Not uncommon
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Old 19-05-2017, 06:09   #4
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Re: Daylight through the hull

Fairly common.

As long as the layup meets the design and there are no signs of structural issues, I wouldn't worry about it.
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Old 19-05-2017, 06:24   #5
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Re: Daylight through the hull

Probably OK but I would look closely at those spots to make sure. Had a friend whose boat was struck by lightening and it left a few little windows where the lightening exited and they were very, very thin little spots of melted fiberglass.
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Old 19-05-2017, 06:38   #6
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Re: Daylight through the hull

You have to have a core or really, really thick glass to not see light through it. From the photos, it looks like the paint is chipped in spots. No big deal at all.

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Old 19-05-2017, 08:09   #7
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Re: Daylight through the hull

chips in the gel coat will let light shine through the laminate.
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Old 19-05-2017, 08:43   #8
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Re: Daylight through the hull

Mine is a little puzzling because the white gelcoat is opaque, but the red in the cove stripe is translucent. Light shows through the stripe area. When I sanded off all the gelcoat blisters, before repainting, the bottom looked like constellations in the night sky.
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Old 19-05-2017, 09:58   #9
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Re: Daylight through the hull

Startling the first time I saw it. But as someone already noted, its fiber-GLASS. Paint will cover it up. Makes you realize how close the water really is. :-)
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Old 19-05-2017, 10:01   #10
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Re: Daylight through the hull

That's good news.... the hull is not cored!
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Old 19-05-2017, 10:17   #11
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Re: Daylight through the hull

Common. Depends on laminate thickness and paints in place.

I was shell shocked to watch a friend doing repairs in his Bava 37 quadrant area - he did not need any extra light in broad daylight.

Only thicker laminates painted over do not shine thru. And off course sandwich ones.

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Old 19-05-2017, 13:08   #12
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Re: Daylight through the hull

Quote:
Originally Posted by Cheechako View Post
That's good news.... the hull is not cored!
Light will shine through cored hull as well (Corecell).
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Old 19-05-2017, 13:11   #13
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Re: Daylight through the hull

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Originally Posted by TeddyDiver View Post
Light will shine through cored hull as well (Corecell).
Interesting... not seen that.
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Old 19-05-2017, 13:38   #14
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Re: Daylight through the hull

I ended up in a law suit over overly thin layup on one side of the boat. Drilled holes in the hole to get thickness samples. The thickest samples came from areas with the most light transfer. You can't tell the thickness of the hull from the amount of light coming through. FRP layups are translucent so don't be concerned about it unless you have other indications like deformations of the hull around bulkheads or anything else touching the hull. Most sailboat mfg's spray an opaque coating between the gelcoat and the FRP layup because people get nervous about the translucent nature of FRP.
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Old 19-05-2017, 16:04   #15
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Re: Daylight through the hull

The chemical hopper in the Ag plane we build is just glass, no Gelcoat. The gauge is a strip with marks indicating capacity, to tell how much water or chemical you have, just look, you can see right through it.
Gelcoat however I think does block quite a bit of light.
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