lexan thickness - Page 2 - SailNet Community
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post #11 of 37 Old 02-23-2009
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Trimmer- which Gasket sealant did you select from Mcmaster-Carr?

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post #12 of 37 Old 02-23-2009
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G.W. I used neoprene rubber. I think it was 3/16 thick. I bought about 2' x 4' and made my own gasket, no sealant of any kind. I drilled holes through the plexi just a little larger then the screws and used a washer w/ a built in rubber gasket (from ace hdwr).No leaks! Btw Mcmaster Carr has so much stuff I recall I had to call for guidence.


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post #13 of 37 Old 02-24-2009
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One thing to remember. If you have to drill holes in plexiglass or polycarbonate, you really want to counter sink the holes on both sides so they don't become a starting point for a stress crack.

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post #14 of 37 Old 02-24-2009 Thread Starter
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I think the rubber gasket makes more sense then various types of caulk, mostly because the white shows through the plexi or lexan when it's overlayed like it is on mine. Painting it black was a thought also. Darn shame the original fixed port frames are gone. (one has to wonder what PO's were ever thinking)

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post #15 of 37 Old 02-24-2009
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Quote:
Originally Posted by deniseO30 View Post
I think the rubber gasket makes more sense then various types of caulk, mostly because the white shows through the plexi or lexan when it's overlayed like it is on mine. Painting it black was a thought also. Darn shame the original fixed port frames are gone. (one has to wonder what PO's were ever thinking)
What are you talking about? The boats look way better once those frames are gone...

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post #16 of 37 Old 02-24-2009
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The gasket approach is also more in line with what the various maufacturer's suggest on their installation data sheets. More time and effort than just gluing things together, so less likely to be found on a stock boat.
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post #17 of 37 Old 02-24-2009
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I have not tried it but I would think that the butyl rubber gasket strips would work well. It stays soft and therefore gives as needed and still seals.

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post #18 of 37 Old 02-24-2009
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The gasket strips sound like a good idea. I am just about to replace 3 large ports with Lexan (AR abrasion resistant) and they have a 2.5 inch thick SS frame inside and out so the gasket will be covered. I had planned on using a goopy sealant, but after reading this thread I am considering other ideas!

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post #19 of 37 Old 02-24-2009
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Denise

If the existiing lexan is in good shape and you want to change to smoked 4 esthetic reasons, why not just overlay the new onto the old. That way even one eighth would be thick enough.
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post #20 of 37 Old 02-24-2009
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Wink

When I did mine I used sheet neoprene. That way I had a seemless gasket. I installed the full sheet, and then carefully trimmed the perimeter with a razor knife. Inside too. The usual trick is to use the external frames inside the cabin on the oposite port. Mine were plastic and broke apart removing them. I made some teak frames for inside the cabin. I'm a little impatient and drilled holes straight through the plexi .Oops no double countersink. As yet, no stress cracks either.( but I do have some stress)
This project took a looong time. Buy beer!


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