Why use JB Weld for magnets?

TennMan
TennMan Posts: 1,266
edited September 2012 in Vintage Speakers
I have used JB Weld for automotive purposes for years so I know how strong it can be.

For gluing the magnets in place on the drivers wouldn't a good clear 2 part epoxy work just as well and look much better? Has anyone tried it?

This may have been covered before but I couldn't find it in a search of this forum.
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Post edited by TennMan on

Comments

  • thsmith
    thsmith Posts: 6,082
    edited September 2012
    I tried loctites clear 2 part epoxy and found it brittle compared to JB Weld.
    Speakers: SDA-1C (most all the goodies)
    Preamp: Joule Electra LA-150 MKII SE
    Amp: Wright WPA 50-50 EAT KT88s
    Analog: Marantz TT-15S1 MBS Glider SL| Wright WPP100C Amperex BB 6er5 and 7316 & WPM-100 SUT
    Digital: Mac mini 2.3GHz dual-core i5 8g RAM 1.5 TB HDD Music Server Amarra (memory play) - USB - W4S DAC 2
    Cables: Mits S3 IC and Spk cables| PS Audio PCs
  • transmaster
    transmaster Posts: 428
    edited September 2012
    J-B Weldbond's formulation it a bit different from most epoxies. It is not for use only as an adhesive but for repair. I have used J-B to repair stripped out bolt holes in engine timing chain covers. It remains flexible enough so you can drill and tap it but strong enough for that tapped bolt hole to hold indefinitely.
    Radio Station W7ITC
  • gdb
    gdb Posts: 6,012
    edited September 2012
    It's also thicker in consistency than (most) regular epoxy and a lot less likely to run/sag.
  • gmjungbluth
    gmjungbluth Posts: 232
    edited September 2012
    With some practice, JB Weld isn't too hard to use and apply neatly. When I 'welded' the drivers on my Polk Monitor 7s and 5s, I used a plastic fork with all but one tine bent off - that way I could apply a small amount of epoxy right into the joint where the magnet meets the plates. that way I got a small amount right in where it needs to be, with little mess. I think my work looks pretty good - and in any case, I hope that I'll never have to pull the drivers back out and see it again! :)
    HT System:
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    In and out of rotation:
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