SailNet Community - Reply to Topic

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Proper adhesive/sealer for Lexan
 Not a Member? 


Thread: Proper adhesive/sealer for Lexan Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
12-06-2013 08:22 PM
socal c25
Re: Proper adhesive/sealer for Lexan

I used the 3M 4000 on my lexan portlights and it work good with no problems, just make sure to follow instructions and everything has got to be clean... really clean.
12-06-2013 07:21 PM
Geoff54
Re: Proper adhesive/sealer for Lexan

I went to the Dow Corning website, did a search for El Salvador and it returned the regional sales office in Mexico. It might be worth a call to see if there is a retailer for near you where you could get one of the industrial silicones.

For purchasing information, please contact this Dow Corning regional sales office directly.

Dow Corning de México S.A. de C.V.
Direct Dial: 55 19 3887 9109

DOW CORNING DE MÉXICO S.A. DE C.V.
BLVD MANUEL ÁVILA CAMACHO 138
PISO2
COL. LOMAS DE CHAPULTEPEC
DEL. MIGUEL HIDALGO
11000 MÉXICO,
DISTRITO FEDERAL
MEXICO
12-06-2013 06:14 PM
miatapaul
Re: Proper adhesive/sealer for Lexan

Quote:
Originally Posted by christian.hess View Post
yeah thanks I know, issue is I dont cant import certain things down to el salvador...

one tube of sealant ends up costing $100, and I have to wait 3 weeks...

hence my questions on alternate sealants if anybody had experience with...

I mean I could use 5200 but I dont want to mess with them in 6 months to a year

anybdoy use only manual methods to seal?
Quote:
Originally Posted by christian.hess View Post
yeah I think 3m is a safe bet...Ill search! and thanks so much!

man is it tough sometimes down here

If you can find a good real commercial supply center, they likely have the right stuff. You want true structural silicone. So if you can find someone who does replacement windows in high rise buildings then they might be able to help. There could be a local product that works well and might even be relabeled version of one of these. 3M products generally are good though, just not 5200.
12-05-2013 05:56 PM
christian.hess
Re: Proper adhesive/sealer for Lexan

Quote:
Originally Posted by Geoff54 View Post
I have a little material cheat sheet - sorry I won't share it because I assembled it over time from multiple sources, some unverified, therefore double check this information if you want to use it.

The most flexible non silicone on my list is 3M 4000UV (Polyurethane) with an elongation at break of > 700% - much greater than 4200, 5200 or most industrial silicones. I believe this is what Morris uses for deck hardware. It's 3M so if you can get 5200 maybe you can get 4000.
yeah I think 3m is a safe bet...Ill search! and thanks so much!

man is it tough sometimes down here
12-05-2013 02:41 PM
Geoff54
Re: Proper adhesive/sealer for Lexan

Quote:
Originally Posted by mitiempo View Post
What brand of hatch? Or did you replace the lens yourself?
On most boats, S2 molded the "Frame" as part of the cabin top and then used either 1/2" or 3/4" lexan cut from flat stock for the hatch. The lexan was drilled and tapped so that hinges and latches could be attached directly.
12-05-2013 02:33 PM
Geoff54
Re: Proper adhesive/sealer for Lexan

Quote:
Originally Posted by DonScribner View Post
795 was reformulated a few years back and is now considered structural but 995 is better.
This sounds very good. Elongation is 525% and the price is reasonable.

"Dow Corning® 995 Silicone Structural Sealant is a one-component, self-priming, shelf-stable, neutral-cure, elastomeric adhesive specifically formulated for silicone structural glazing and exhibits excellent unprimed adhesion to most building substrates. This product has superior unprimed adhesion for structural glazing applications for hurricane or impact rated windows and doors. It has a movement capability of +/- 50%."
12-05-2013 02:26 PM
mitiempo
Re: Proper adhesive/sealer for Lexan

Quote:
Originally Posted by Geoff54 View Post
My hatches are of unsupported polycarbonate and they flex very little. But they are 3/4" thick
What brand of hatch? Or did you replace the lens yourself?
12-05-2013 02:24 PM
Geoff54
Re: Proper adhesive/sealer for Lexan

Quote:
Originally Posted by Maine Sail View Post
Unless your hatch has "cross bars" to support the Lexan it was NOT designed for Lexan and was designed for cast acrylic.

Lexan foreshortens/flexes when stepped on thus breaking the seal. More than one owner has landed in a cabin due to using the WRONG material in a hatch lens replacement.

Lexan/polycarbonate is pretty much shatter proof but flexes a LOT more easily. Cast acrylic flexes less, and can be cracked, but holds up in UV a lot better. The vast majority of plastic ports and hatches are made of cast acrylic not polycarbonate. Only some Bomar's are made from Lexan and they have cross bars under the glass.
My hatches are of unsupported polycarbonate and they flex very little. But they are 3/4" thick
12-05-2013 02:14 PM
Geoff54
Re: Proper adhesive/sealer for Lexan

Quote:
Originally Posted by christian.hess View Post
i need help guys...and I dont want ot order sealants from the states

Im about to do my portlights, they are the flush sealed type

they have a gasket(rubber) and had what seems to be butyl tape AND screws dammit

we do not have ANY of the sealants mentioned except for 5200

we have MANY window and construction type sealants...my best guess was one made by dap or similar

it was water based very felixible and stayed soft unlike 5200

would this be a good sealant to try out?

what other brands names that home depot or similar carry that I could search for down here?

thanks
I have a little material cheat sheet - sorry I won't share it because I assembled it over time from multiple sources, some unverified, therefore double check this information if you want to use it.

The most flexible non silicone on my list is 3M 4000UV (Polyurethane) with an elongation at break of > 700% - much greater than 4200, 5200 or most industrial silicones. I believe this is what Morris uses for deck hardware. It's 3M so if you can get 5200 maybe you can get 4000.
12-05-2013 01:56 PM
DonScribner
Re: Proper adhesive/sealer for Lexan

As has been said already, plasticizer migration is a serious problem when sealing plastics. DO NOT use a polyurethane based sealant on any plastic, polycarbonate, acrylic, copoly. Stay with the silicone based STRUCTURAL sealants. 795 was reformulated a few years back and is now considered structural but 995 is better. As far as polycarbonate in the sun . . . my company has been supplying it for 30 years. We are a skylight manufacturer. Draw your own conclusions. We moved from cast acrylic (which we invented) because polycarbonate is more impact resistant, ie, more flexible. We now supply impact modified acrylic in lieu poly and have moved to a cheaper material (copolyester) for commercial applications.

The best way to install any plastic with silicone is to adhere the material with structural glazing tape, 3/16" min and about 1/4" from the edge. Mask the surface of the glazing and the perimeter of the mounting area leaving a 1/4" gape around the perimeter. This adheres the glazing and supplies the space that others have suggested by shims. Inject the silicone under the glazing and apply a bead completely around it. Now comes the REAL IMPORTANT part: tool your joint. I use tooling spray and a plastic spoon for a joint that looks like a perfect rubber gasket. If you don't tool the joint, it isn't complete or watertight. Water will find it's way in. Sealant manufactures won't warranty their products if the joints aren't tooled. And don't believe any testosterone fueled boasts about never needing to tool. I will stand on, "If they say that, they don't know what they're talking about."
This thread has more than 10 replies. Click here to review the whole thread.

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


All times are GMT -4. The time now is 09:00 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.