rear window, 3m window adhesive |
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rear window, 3m window adhesive |
914 shifter |
Oct 17 2010, 05:26 PM
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#1
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airhead Group: Members Posts: 266 Joined: 28-August 10 From: ny/nj Member No.: 12,111 Region Association: North East States |
thinking of using 3m window adhesive instead of butyl tape.has anyone tried this.
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McMark |
Oct 17 2010, 06:00 PM
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#2
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I haven't tried it. I'm comfortable with the fact that butyl is the factory spec, it's easy to work with, and it holds up over time. What benefits or upgrades are you expecting from '3m window adhesive'?
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aircooledboy |
Oct 17 2010, 06:25 PM
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#3
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Sweet Pea's 1st ride in daddy's "vroom -vroom" Group: Members Posts: 1,672 Joined: 4-February 04 From: Rockford, IL Member No.: 1,629 Region Association: Upper MidWest |
I presume you are referring to 3m urethane. Much trickier to use than butyl for a rear window with no real up side. Urethane on a vertical window requires rubber blocks in the bead, and mechanical clamping to hold the glass until it cures. If the bead gets too thin, you risk having the glass blow on a good bump. On the other hand, the back glass has no structural load, so you don't lose anything with the less rigid seal that butyl gives you, but get a much easier install in the deal.
(IMG:style_emoticons/default/beerchug.gif) |
914 shifter |
Oct 17 2010, 06:50 PM
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#4
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airhead Group: Members Posts: 266 Joined: 28-August 10 From: ny/nj Member No.: 12,111 Region Association: North East States |
I haven't tried it. I'm comfortable with the fact that butyl is the factory spec, it's easy to work with, and it holds up over time. What benefits or upgrades are you expecting from '3m window adhesive'? it comes in a caulking tube so it would be easy to apply.it is inexpensive $12.50. for one cartridge.also i ask what size butyl tape ,and i get many different answers like: round, rectangle ,square, 1/4 inch, 3/8 inch ...........?do you know the correct size/ dimension butyl tape?.i have spoken to to a few auto glass installers, and they said the new adhesive is the way to go,but it is a 914 so they could be mistaken (IMG:style_emoticons/default/flag.gif) |
914 shifter |
Oct 17 2010, 06:59 PM
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#5
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airhead Group: Members Posts: 266 Joined: 28-August 10 From: ny/nj Member No.: 12,111 Region Association: North East States |
I presume you are referring to 3m urethane. Much trickier to use than butyl for a rear window with no real up side. Urethane on a vertical window requires rubber blocks in the bead, and mechanical clamping to hold the glass until it cures. If the bead gets too thin, you risk having the glass blow on a good bump. On the other hand, the back glass has no structural load, so you don't lose anything with the less rigid seal that butyl gives you, but get a much easier install in the deal. (IMG:style_emoticons/default/beerchug.gif) ok thanks. i thought it might be easy to apply,and stick the glass to it like butyl.i will have to fully investigate.by the way what size butyl do you recommend. |
aircooledboy |
Oct 17 2010, 07:13 PM
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#6
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Sweet Pea's 1st ride in daddy's "vroom -vroom" Group: Members Posts: 1,672 Joined: 4-February 04 From: Rockford, IL Member No.: 1,629 Region Association: Upper MidWest |
Standard rule is 3/8" for bare metal install, 5/16" if layering on top of old, but stable and solid base left over from a clean hot knife removal. So, in most cases it will be 3/8". Square or round never made much difference to me. Once you set the glass and squish it down, they are both the same shape in the end. (IMG:style_emoticons/default/biggrin.gif)
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McMark |
Oct 17 2010, 07:33 PM
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#7
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Direct from the factory manuals. Trust the factory manuals, not glass guys who've never picked up a technical manual in their life.
8mm = 0.31496063" ~ 5/16" Butyl If you think urethane is easier to work with, you haven't used both and been able to compare. Urethane is like trying work work with toothpaste, and butyl is like trying to work with sticky licorice rope. Butyl is far, far easier - just remember that there's no sliding the glass around. You get one shot and once it's stuck it's stuck. Attached image(s) |
aircooledboy |
Oct 17 2010, 08:02 PM
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#8
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Sweet Pea's 1st ride in daddy's "vroom -vroom" Group: Members Posts: 1,672 Joined: 4-February 04 From: Rockford, IL Member No.: 1,629 Region Association: Upper MidWest |
On a small vertical window like a 914 back glass, 5/16" even on a "down to metal" install. You just need to be careful on the corners not to stretch it thin in the corners. Patience and a little back pressure as you lay the corner, it'll be all good.
A glass shop would use 3/8" tape 9 out of 10 times just out of habit on a clean metal install. As I climb into the Wayback machine, it seems to me I did often use thinner tape on nearly vertical installations (i.e. pickup truck back windows) or they would sit up too high. 1 beer for McMark. (IMG:style_emoticons/default/beer.gif) 5/16" is the right call. |
914 shifter |
Oct 18 2010, 06:01 AM
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#9
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airhead Group: Members Posts: 266 Joined: 28-August 10 From: ny/nj Member No.: 12,111 Region Association: North East States |
ok fellas i'm going with 5/16 butyl $6.00 from local glass shop.thanks you for your enthusiastic support! (IMG:style_emoticons/default/cheer.gif)
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Mikey914 |
Oct 19 2010, 08:55 PM
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#10
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The rubber man Group: Members Posts: 12,678 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
You can actually stretch the 3/8" to make it fit (just a technique). That's why the glass guys don't worry about the thickness, they make it work by stretching.
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