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  1. #1

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    Feb 2011

    Default Why use JB Weld for magnets?

    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.
    SDA 2BTL Sonicaps Mills resistors RDO-198s New gaskets H-nuts Erse inductors Crossover upgrades by westmassguy
    Adcom GTP-450 preamp
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  2. #2

    Member Sales Rating: (22)

    Join Date
    Oct 2008
    Directly over the center of the earth in Olathe Kansas


    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

    Ofc: Wright WLA12 preamp: Anthem Amp 1: Pio Elite DV-79AVI: Airport Express: CAL Sigma II DAC: PA LS90 sonicaps and mills

  3. #3

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    Mar 2012
    Cheyenne, Wyoming


    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.

  4. #4

    Member Sales Rating: (8)

    Join Date
    May 2008
    At a comfortable distance.... gaining perspective


    It's also thicker in consistency than (most) regular epoxy and a lot less likely to run/sag.

  5. #5

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    Jan 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:
    Pioneer VSX-820-k
    Front: Polk Monitor 7B Restored
    Rear: Currently not in service
    Center: Boston Acoustic VR12
    Sub: Bowers & Wilkins ASW600

    Restored Pioneer VSX-1250
    Yamaha P-500 Turntable

    Living Room:
    NAD 7240PE
    Klipsch KG4

    Harman Kardon 3380
    Bowers & Wilkins DM601
    Polk PSW10

    In and out of rotation:
    KLH Model 6,
    Polk Monitor 5 Series II
    Design Acoustic PS-10A
    NAD 7100

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