How many cans of 3M Super 77-90 to cover a tweed deluxe cab?

Discussion in 'Amp Tech Center' started by Chunkocaster, Feb 22, 2020.

  1. Chunkocaster

    Chunkocaster Poster Extraordinaire

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    I'm waiting on some tweed I ordered a month ago to arrive and am getting everything ready to finish a 5e3 cab in tweed cloth. How many cans of 3m super 77 or 90 will I need?

    Cheapest I could find it here was $35 bucks a can from Officeworks so I don't want to buy more cans than I need. I'm hoping one can will do it but don't want to get caught short half way through the last panel.
     
  2. Dirty Dave

    Dirty Dave TDPRI Member

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    1 should totally do it.
    You don't need massive amounts of it to make a really good contact on both surfaces.
     
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  3. Chunkocaster

    Chunkocaster Poster Extraordinaire

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    Thanks, I was worried it was going to cost me a small fortune in adhesive. Will there be much leftover from one can?
     
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  4. Dirty Dave

    Dirty Dave TDPRI Member

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    I used to work with an upholsterer, and we used a lot of spray glue.
    I’d expect to use about a third of a can tops.
    Maybe half if you really hammer it.
     
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  5. Jon Snell

    Jon Snell Tele-Meister

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  6. Kevin Wolfe

    Kevin Wolfe TDPRI Member

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    What Jon Snell said. You want to be able to adjust it before it locks down. Stay away from the spray glue.
     
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  7. Jon Snell

    Jon Snell Tele-Meister

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    A few guys around here use carpet glue and it is absolute rubbish. In a year or so as it decays and unbonds itself, as is the intention for carpets.
     
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  8. Chunkocaster

    Chunkocaster Poster Extraordinaire

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    Thanks, that stuff looks interesting. It's over $100 bucks delivered here though. I might wait until the tweed arrives and see how flexible it is before buying the adhesive. If it's semi rigid i'll just stick with 3m spray.
     
  9. Larmo63

    Larmo63 Friend of Leo's

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    I've done tweed cabinet covering/repair and 90 is what you want to use. 77 is for paper and lighter weight type stuff. I don't know about the other product mentioned, it sounds good too. I would get a pint can of contact cement also and use disposable 'chip' brushes. Spray the fabric, brush the box. Tweed is VERY stiff, at least the normal type.

    Mask off areas that you don't want spray glue to hit with a hand masker (tape/paper.) That s__t can fly everywhere.

    It's a bit tricky, but take your time. Good luck!
     
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  10. Chunkocaster

    Chunkocaster Poster Extraordinaire

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    Thanks, I was leaning more towards the 90. I want to keep costs to a minimum so will just use the spray if there's enough to cover both the cab and tweed. I watched a video recently and noticed the masking, good idea. The last time I tolexed a cab was a 4x12 in the mid 80's using a compressor to spray Sikaflex contact adhesive. It turned out well and lasted for the 20 years I had the cab. I didn't have to clean the gun back then though so I will stick with aerosol.:)
     
  11. Bill Moore

    Bill Moore Tele-Afflicted Silver Supporter

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    I'm not sure where you're located, but the last I bought was about $15 at my local Walmart.
    That was more than a year ago, but I wouldn't think it should have doubled since then!
     
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  12. Chunkocaster

    Chunkocaster Poster Extraordinaire

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    I'm in Australia where everything is at least double the price.
     
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  13. Larmo63

    Larmo63 Friend of Leo's

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    Having a bit to brush on in certain places is helpful.

    Just saying.
     
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  14. Whatizitman

    Whatizitman Friend of Leo's

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    One can is enough.

    I used 77 on my 1x12 with black tolex. I’ve had to do multiple touch-ups. Go with 90.

    The 77 was ok on bare wood, but not where any paint was inside the cab. It’s also not strong enough for tolex on tolex. I finally used some wood glue on some overlays that kept separating. Worked far better. Live and learn.
     
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  15. ronzhd

    ronzhd Tele-Holic

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    I don't know......., I'm not talented like that. Amp building and upholstering. I would be wearing that glue from one end to the there though. Anyway, all that to say....how about pics of before and after?
     
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  16. Chunkocaster

    Chunkocaster Poster Extraordinaire

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    I'll take a few of the bare cab when I finish it and then after applying the tweed. I'm rehousing a Joyo 5f1 clone in the 5e3 sized bee box cab with a choice of two baffles, one being a 2x8" and the other a single 12" speaker.

    I'm covering the cab in Chinese cloth tweed that looks close to fenders in the pics and using oxblood grill cloth on both baffles, i'm also going to amber shellac the cab when done.
     
    Last edited: Feb 22, 2020
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  17. Chunkocaster

    Chunkocaster Poster Extraordinaire

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    The 90 is the same price so I will go with that, good to know it works better. Hopefully it doesn't get upset when applying shellac over it.
     
  18. schmee

    schmee Poster Extraordinaire Silver Supporter

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    NONE, use real contact cement...
     
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  19. archetype

    archetype Fiend of Leo's

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    Wear at least a mask, if not a respirator when spraying adhesive. I used to use the 3M on the job and can tell you that spray adhesive can coat your lungs.
     
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  20. Alamo

    Alamo Doctor of Teleocity

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    None.

    I've used heavy duty wallpaper paste with some wood glue mixed in.
    all water based - no toxic fumes.
    with excellent results.

    also, some excess can be wiped off with a damp cloth and it dries up clear.
     
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