Locally available adhesive for foam surround to basket? - diyAudio
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Old 28th December 2005, 12:42 AM   #1
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Default Locally available adhesive for foam surround to basket?

I just received a used Avalanche 18 and noticed a couple of sections of the surround that are completely separated from the basket.

Is there a suitable adhesive locally available? I don't want to wait to order it from a speaker repair place.

Will contact cement work, or will that eat into the surround?

How about weatherstrip adhesive?

Thanks
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Old 28th December 2005, 01:08 AM   #2
ScottG is offline ScottG  United States
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Default Re: Locally available adhesive for foam surround to basket?

Quote:
Originally posted by noah katz
I just received a used Avalanche 18 and noticed a couple of sections of the surround that are completely separated from the basket.

Is there a suitable adhesive locally available? I don't want to wait to order it from a speaker repair place.

Will contact cement work, or will that eat into the surround?

How about weatherstrip adhesive?

Thanks

I've always used 100% silcone caulk for trouble spots between the diaphram and surround (foam included) with never any serious problems beyond added mass. However that's compliant and might not be best between surround and basket? Perhaps a poly glue that foams (like gorilla glue or the weaker elmer's version).. it always looks like "brown".
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Old 28th December 2005, 01:30 AM   #3
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I'll visit OSH and see what they've got.

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Old 28th December 2005, 02:16 AM   #4
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Loctite 410 or 411. Fastenal carries the stuff in little tiny tubes, like 20 ml tubes. That's enough to secure the surround and spider of a typical 15" driver to the frame.

Spread the glue under the spider, then replace the rubber gasket to hold the surround down to the frame while the glue dries. Give it a good 24 hours.

Dan Wiggins
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Old 28th December 2005, 05:53 AM   #5
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Thanks Dan!

The original adhesive is a yellowish, fairly stiff but stretchy stuff.

Do I need to scrape it off or will 411 (there's a Grainger's near me that carries it) stick to it?

It's hard to tell how much I need to do; the surround is pretty thick and stiff, so when I lift it I may be pulling more away.

Will the 411 wick into the gap or do I need to fully apply it to one or both surfaces?

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Old 28th December 2005, 08:48 AM   #6
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Hmm, I don't see how to edit posts.

Anyway, by pushing from behind I can tell where it's become unattached.

The problem with scraping off the old adhesive is that I can't do it all the way to where it's still adhered without pulling it further away.

I guess the best thing would be to pull it off all the way around, but I'm afraid the voice coil will lose centering.

Then I'd have to cut off the dust cap, which I don't know if I can do without damaging the cone, to shim the VC.
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Old 28th December 2005, 10:01 AM   #7
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Assumption:- surround = foam seal?

I don't see how removing the surround would make the cone loose its centre if its still attached to the chassis.

Anyway, theres a clue here. If its coming off, the manufacturer didnt feel the need to use a really strong glue. Its usually held in place between the chassis and woodwork. It probably pealed away because it stuck to the cabinet. All you need to do is hold it in place until you bolt it into its new home, so don't over do it.

I wouldn't use an anaerobic advesive like Loctite because foam will not exclude the air to enable a cure. I would have thought a rubberised contact glue would be just fine. Use the one with all the nasty solvents. They work best .........and it gives you something to do while it sets.

If its not the foam seal - ignore everything above
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Old 28th December 2005, 12:05 PM   #8
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go to a local bodyshop or where they sell car parts and buy this seal sold in roll which is very thin and is used to glue on both sides for door moldings you can turn it in circles,and it sticks like hell!!!
I used it tu isolate my bottom of the speaker box by glueing only 1 side,I didnt peel the other side so I can open the box and work on the xover when I need to.
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Old 28th December 2005, 02:22 PM   #9
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Noah,

Clean it as best you can. The Loctite rubberized CAs (411 is one of them) will bond to most things, and you only need to place it on the basket and apply pressure. The better you can clean the basket, through, the better the bond (as with all glues).

If you want to replace ALL the glue, then do it in stages. Do half of the surround/basket with the 411 now, let it fully dry (remember to clamp the surround down with the rubber mount gasket!), then do the other half.

Dan Wiggins
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Old 28th December 2005, 05:05 PM   #10
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Thanks Dan, that's what I'll do.

Pbassred,

Assumption:- surround = foam seal?

1. The with the surround detached, the spider behaves as a ball joint and will allow the front of the cone to move sideways

2. I haven't seen a rear mounted driver in decades

3. Loctite is a brand name and they make dozens of products besides their anaerobic thread lockers
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