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Old 09-03-2014, 14:15   #16
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Re: Lewmar Superhatch lens replacement

I rebuilt mine only to learn a year later a polycarbonate exists with uv inhibitors. Find that stuff and use it.
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Old 10-03-2014, 06:04   #17
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Re: Lewmar Superhatch lens replacement

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I rebuilt mine only to learn a year later a polycarbonate exists with uv inhibitors. Find that stuff and use it.
Why use polycarbonate instead of the spec acrylic? Because it is more expensive? Or because it scratches more easily?
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Old 10-03-2014, 07:28   #18
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Re: Lewmar Superhatch lens replacement

I read it is much, much stronger.
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Old 10-03-2014, 08:17   #19
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Re: Lewmar Superhatch lens replacement

Stronger yes, but more expensive and less scratch resistant.

If the hatch was properly designed in the first place, and that design included the use of acrylic as a glazing material, then substituting a stronger material will provide no appreciable benefit to the use and performance of the hatch.

As it is, I replaced my thirty year old hatch lenses for aesthetic rather than structural reasons. In spite of the acrylic material having been significantly degraded with age, it had not failed structurally. At what point the crazing impacts the strength of the material enough for it to be a concern I couldn't say.
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Old 11-03-2014, 00:53   #20
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Re: Lewmar Superhatch lens replacement

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Originally Posted by Ketchgould View Post
I rebuilt mine only to learn a year later a polycarbonate exists with uv inhibitors. Find that stuff and use it.
Polycarbonate is more flexible than acrylic. Bomar is the only hatch manufacturer that uses it. The hatches that it is used on have bars across the opening because otherwise when stepped on it deflects enough to break the seal. Acrylic is the choice of Lewmar, Goiot, Atkins and Hoyle, and many others.
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Old 04-05-2014, 15:15   #21
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Re: Lewmar Superhatch lens replacement

Hi Delancey,
This is a great tutorial. I am faced with repairing my Superhatches or replacing them. Since I live in Guatemala, replacement hatches would be very expensive, duties, etc. From your description I believe we can do a lens replacement. It would be very helpful to have the Autocad files, if you still have them. My forehatch measures 70x70cm interior.
Best
Jean
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Couple final thoughts-

Cost to replace from WM was about $3,100 for my five hatches, not including shipping. Select Plastics was a little more plus had like a six or eight week lead time which just did not work for me.

My cost was $250 for the acrylic, $16 for the zinc chromate primer, and I think like $10 for the butyl tape from EBay plus about 16 hours of my time.

I decided to reuse the hatch seals. That wasn't me being cheap, that was me thinking these things are going to go in a landfill for the next 100,000 years if I throw them away, besides, the hatches don't leak at the seal so if it ain't broke don't fix it.

The seals themselves are made from a type of material called EPDM that is used for roofing. If I ever have problems with them I will let you know.

If you want I can save you a little time and give you my AutoCAD drawings, you can give these files to anybody who cuts using a CNC. PM me an email. My hatches were sized 60, 40, and 20.
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