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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 25 Specific Forum
 Lexan Ports Sealant/Adhesives		  New Topic  Topic Locked
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Bladeswell
Captain

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USA
490 Posts
Initially Posted - 08/27/2015 :  16:25:10  Show Profile  Visit Bladeswell's Homepage
Hello Everyone,

I am currently replacing my original framed ports with frameless Lexan. After doing some research I have narrowed down my sealant/adhesive choices to either Boatlife Life Seal or Dow Corning 795. I would like your opinions and input before I make the final choice. I understand some may feel I should have went with Acrylic rather than Polycarbonate but that is not my question. And the Lexan is already bought and payed for. Thanks again and fair winds to all.

Bladeswell
C25 TR FK Hull #973 1979 L-Dinette. So.Cal.

Davy J
Master Marine Consultant

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USA
1511 Posts
Response Posted - 08/27/2015 :  16:55:41  Show Profile
I replaced my '87 port-lights with acrylic. I had an older powerboat that I replaced the windows with poly. My experience is that neither will stand up to the sun. Whatever you use, make some covers immediately.

As far as the sealant, Catalina uses Dow 795 on new boats. That is what I used to replace my windows. You can read about it here:
http://www.catalina-capri-25s.org/forum/topic.asp?ARCHIVE=true&TOPIC_ID=23031



Davy J


2005 Gemini 105Mc
PO 1987 C25 #5509 SR/SK
Tampa Bay
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Bladeswell
Captain

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USA
490 Posts
Response Posted - 08/27/2015 :  18:44:43  Show Profile  Visit Bladeswell's Homepage
Thanks Davey,

I will heed your advice on making covers. How many tubes of DC 795 do I need for the job ? Thanks again.

Bladeswell
C25 TR FK Hull #973 1979 L-Dinette. So.Cal.
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Davy J
Master Marine Consultant

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USA
1511 Posts
Response Posted - 08/28/2015 :  03:19:08  Show Profile
I purchased two tubes of sealant, but only used one.
Davy J


2005 Gemini 105Mc
PO 1987 C25 #5509 SR/SK
Tampa Bay
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sethp001
Mainsheet C-25 Tech Editor

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814 Posts
Response Posted - 08/28/2015 :  10:07:58  Show Profile
Would 795 work for rebedding the sunlight in the foredeck. I used 4200 last time, but now its leaking again. Apparently 4200 deteriorates in the presence of some deck cleaners/solvents.


Seth
"Outlier" 1987 Catalina 25 SR/SK/Traditional Interior #5541
"Zoo" 1977 Morgan Out Island 30
"Nomad" 1980 Prindle 16
"Lost" 1988 Catalina Capri 14.2 (sold - yay!)
"Marine Tex 1" Unknown Origin POS 8' Fiberglass Dinghy
https://whichsailboat.com/2014/07/27/catalina-25-review/
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Steve Milby
Past Commodore

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USA
5851 Posts
Response Posted - 08/28/2015 :  10:18:36  Show Profile
I had my portlights professionally replaced, and they said both acrylic and lexan expand and contract. Don't cut them to fit too closely. Look at another boat of recent vintage to see how much space the builder left. Leave a little room for expansion. For that reason, it is better if you install them without using screws.
Steve Milby J/24 "Captiva Wind"
previously C&C 35, Cal 25, C25 TR/FK, C22
Past Commodore
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Stu Jackson C34
Admiral

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844 Posts
Response Posted - 08/28/2015 :  12:14:44  Show Profile
quote:
Originally posted by sethp001

Would 795 work for rebedding the sunlight in the foredeck. I used 4200 last time, but now its leaking again. Apparently 4200 deteriorates in the presence of some deck cleaners/solvents.


Seth, 4200 and its evil twin sister 520 are adhesives, not sealants. For anything that MAY, I say may, need to be removed in the future, a sealant is far superior to do the task.
Stu
1986 C34 #224 "Aquavite"
Cowichan Bay, BC Maple Bay Marina
(formerly San Francisco)
(formerly C25 #2459 "Capricorn Two")
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islander
Master Marine Consultant

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USA
3992 Posts
Response Posted - 08/28/2015 :  13:32:08  Show Profile
quote:
I used 4200 last time, but now its leaking again

That's because 4200 isn't compatible with plastics. It will eat the plastic and eventually leak. Boatlife Life Seal or Dow Corning 795 is made for bedding plastics. I used Life Seal on my dead light without any problems.
quote:
LifeSeal® offers a fast-curing, low odor, high adhesion, non-sagging, non-corrosive, non-yellowing formula. It provides a durable permanent watertight seal for joints subject to structural movement. May be used above and below the waterline. Use for sealing decks to hulls, thru-hull fittings, vinyl ports, sealing/glazing windshields and bedding marine hardware. Will adhere to metal, glass, wood, Lexan®, ABS® and certain other materials.

Please people, DO NOT USE polyurathane sealants to bed plastics. It will fail.
Also IMO Regular Silicon has no place on a boat.
3M 4200. Notice the incopatability.
quote:
Formulation: One-part fast-cure polyurethane adhesive/sealant
Recommended Usage: Fiberglass, wood, metal, some plastics, above or below water
Material Incompatibilities: Acrylics ABS, Lexan
Cure Time: Tack free: 2 hrs; complete cure: 24 hrs
Cleanup: Mineral spirits or kerosene
Removal: Mechanical removal
Tensile Strength: 300psi
Scott-"IMPULSE"87'C25/SR/WK/Din.#5688
Sailing out of Glen Cove,L.I Sound


Edited by - islander on 08/28/2015 14:03:01
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sethp001
Mainsheet C-25 Tech Editor

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814 Posts
Response Posted - 09/02/2015 :  12:45:53  Show Profile
Thanks Scott! I just ordered some Boat Life!


Seth
"Outlier" 1987 Catalina 25 SR/SK/Traditional Interior #5541
"Zoo" 1977 Morgan Out Island 30
"Nomad" 1980 Prindle 16
"Lost" 1988 Catalina Capri 14.2 (sold - yay!)
"Marine Tex 1" Unknown Origin POS 8' Fiberglass Dinghy
https://whichsailboat.com/2014/07/27/catalina-25-review/
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Voyager
Master Marine Consultant

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USA
5231 Posts
Response Posted - 09/02/2015 :  15:01:42  Show Profile
Rather than covers you might want to apply a UV protectant. Some window tints provide it. End of the day it's not heat, light or infrared that does the damage but the UV. Good luck with your installation.
Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT
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sethp001
Mainsheet C-25 Tech Editor

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814 Posts
Response Posted - 09/04/2015 :  17:56:11  Show Profile
Once I pierce the Life-Seal tube, does it quickly expire like the 3M products? As in I should try to use the entire tube within 24 hours?


Seth
"Outlier" 1987 Catalina 25 SR/SK/Traditional Interior #5541
"Zoo" 1977 Morgan Out Island 30
"Nomad" 1980 Prindle 16
"Lost" 1988 Catalina Capri 14.2 (sold - yay!)
"Marine Tex 1" Unknown Origin POS 8' Fiberglass Dinghy
https://whichsailboat.com/2014/07/27/catalina-25-review/
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.