Appropriate adhesive - rubber to metal w/textured finish

msg

I have some acoustic mastic that I bought years ago from McMaster-Carr. It's heavy, rubbery stuff, and is supposed to work as an acoustic damping material, like Dynamat. It does work pretty well for deadening. I've used it before to line the tinny doors, floor, and body of an older Toyota pickup when I was installing a stereo.

I'm trying to damp the bases of the Sanus SF26 stands I've been playing around with, but the adhesive on the mastic sheets is a bit weak now, and to complicate things further, the stands have a textured finish, so the mastic strips I've cut aren't sticking. I cleaned the surface of the stand with isopropyl, and have also tried heating both the stand and mastic, but that doesn't seem to work either.

Anyone know of any liquid adhesive I could use for this? I've considered using thin double-sided tape, as well, or just abandoning and buying some Dynamat, but would really like to make this work. It's good stuff if I can get it applied.

Also need to source locally a narrow, firm roller to really stick this stuff down.

I'd like this to be neat, so whatever I use has to clean up nicely and not compromise the damping effect of the mastic, like maybe an adhesive that hardens might.

I have some Gorilla Glue but haven't even opened it because, frankly, I can't really see it being good for anything. I tried some several years ago, and that expandy bs makes it more of a nuisance than its worth, imho.

If you have any ideas, feel welcome to let 'em rip.
Thanks

Mikey081057

Look at the 3M site for a double sided tape that fits your app

http://solutions.3m.com/wps/portal/3M/en_US/Adhesives/Tapes/Products/~/Double-Sided-Bonding-Tapes?N=5472715&rt=c3

F1nut

The 3M VHB tape would work.

msg

thanks guys, I'll look into these.

pitdogg2

F1nut wrote: »

The 3M VHB tape would work.

This above or brush on contact cement to both then let dry and apply now as you know get where you want first as when they both touch it will be game over as it will be stuck

msg

Hey guys, just reporting back. I really wanted to try to get this going this weekend, and none of the standard big-box shops had any of the acoustical sealant or 3M VHB. Pit - I was out and about before seeing your recommendation. I had considered something like contact cement, but I've never used it and wasn't really sure what to expect, and it just screams "mess" hehe

I also stopped by a couple of auto places to see what they had, and not much really seemed appropriate. However, I did see that there were some spray adhesives for affixing trim and such, and it got me thinking. I thought I had some spray adhesive at home, so decided I'd give that a shot to see how it would work before buying more.

So I had an old can of Elmer's Spray Adhesive, almost empty, but was juuuuust enough to experiment on those four strips of mastic. I took them outside and laid them out close together on cardboard. They recommend spraying both surfaces to be bonded, but I didn't want the hassle of spraying the stand, so I went with a single heavy coat on the strips only, put down in a couple of passes about 4" away. For permanent bond they recommend immediate affixing, as opposed to waiting for dry/tack time, so that's what I did, and had them all on probably within 2 minutes or so of spraying.

So far so good. The strips went down pretty close and pretty tight. In fact, I started to place one not quite right and it was already a little difficult to move even with just an edge partially applied. Got them down, pressed, and it looks like this is going to do the trick, nice and neat. Gave them a quick wipe with a cloth dampened with some acetone. The corners aren't lifting or anything. The heavy spray coat should probably get enough into the textured finish of the stands. I'm gonna run out and try to find some more real quick and knock this out.

Since I have so much of this mastic laying around, I'm wondering whether there would be any benefit to doing a double layer?

http://elmers.com/product/detail/E451

msg

Like much of this hobby, doesn't look like I'll be getting out of this cheaply after all.

Upon inspection of the stands this morning after standing upright overnight, the edges of the mastic are starting to lift; beginnings of curling. Not by much, but over time, I think they'll probably fall off under their own weight. Luckily I only finished cutting the material yesterday, and didn't get the rest of it mounted. I went with a double layer on the strips for added weight, so I imagine this will only happen faster.

I'm going to try the 3M Super 77 or maybe the 3M Super 90 spray adhesive, paying careful attention to the ends. In the meantime, I'll order some 3M VHB tape, and maybe just use that at the edges/ends if the 77 or 90 doesn't hold up. It's really just the edges that seem to need the extra attention; this stuff is typically stored rolled up, so the tendency is to lift, especially with shorter strips and probably more so now that it's doubled up.

I know I could just go with Dynamat and be done with it, but I'm already into it, so just detailing the process in case anyone can use info on use of these types of materials and adhesives.

pitdogg2

msg wrote: »

I'm going to try the 3M Super 77 or maybe the 3M Super 90 spray adhesive

both of these like the Elmer are a type of contact adhesive and like brush on contact adhesive it will only stick to contact cement. spray both then let dry THEN place where you want. Unless there is more of a problem than we know it should work well. Putting on the VHB 3m might not work as well now that there is going to be another layer of junk between it and what you really want to glue.

msg

ah, gotcha. probably why they say to spray both surfaces and let tack up.
I was trying to get away from doing anything on the stands directly, simply due to the prep time to keep it neat and clean; taping/masking application areas and such. I have four of these to do at four strips each; that's a lot of tape work.

good point on adding VHB at this point.

I was thinking the bonding strength and finish state of the Elmers just wasn't strong enough. I thought that immediately affixing the strips to the stand would result in a more stronger more permanent bond per the instructions, but it's looking like you say - I need to prep both surfaces for best results.

this is seemingly becoming a much "bigger deal" than it needs to be

pitdogg2

that is why i recommended brush on:) only goes where you stroke it

msg

there's a joke in there somewhere, I'm sure, lol

hehe, yeah, I was just realizing that, and was thinking earlier whether there may be a way for me to spray it into a cup and apply it by acid brush or something.