What's the best glue to join metal to concrete?

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timmmay

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#228674 16-Jan-2018 21:26

My greenhouse door has a cabin hook, with the bit it hooks into stuck onto the side of concrete block shed wall. Well, it was mounted on a concrete shed, it came off in the wind about two years after I mounted it there with some adhesive I don't remember.

I've tried two part araldite (fell off) and Ados F2. Neither stuck the metal to the concrete wall well.

Do I need a different adhesive? Could be that I just need to hold one of those ones longer until it sets?

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#1940212 16-Jan-2018 21:35

I would screw it into the concrete with a couple of nylon anchors.

[url}https://www.mitre10.co.nz/shop/hardware/fasteners-fixings/masonry-drywall-anchors/c/RF5131?q=%3ApriceValue-asc%3Acategory%3ARF5131%3AfineLine%3AAnchor+toggle+masonry&text=&categorySelected=Entire+site#[/url]

Reminds me I must do this to the front screen door on our house.

Bung

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#1940213 16-Jan-2018 21:37

Concrete block drills easily (no big stones in the mix). Use screws in the holes provided or screw the fitting onto a piece of wood and glue the larger piece to the concrete. I don't think your metal part has enough surface area for glue to work directly.

peejayw

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#1940214 16-Jan-2018 21:38

I would have thought Araldite would do the job.

You will need to remove all traces of the previous adhesive from both surfaces so wire brush on the concrete and perhaps a file on the metal part to provide a rough surface for the adhesive to bond to. then clean both surfaces to remove grease/oil from the surface. Meths or acetone perhaps. Mix the Araldite as per instructions and apply generously then clamp the two parts for 48 hours.

I'm supposed to respect my elders, but it's getting harder and harder for me to find one now.

timmmay

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#1941245 17-Jan-2018 07:33

I don't really want to drill. It's old, if it's weak and the block crumbles I have a big problem.

I guess I'll try araldite again thans @peejayw. NOt sure how to clamp a piece of metal to a flat wall, might have to tape it or something.

SATTV

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#1941247 17-Jan-2018 07:51

I know you only want a small amount but what about gorilla grip?

https://www.bunnings.co.nz/gorilla-grip-construction-adhesive-10-minute-cure-310ml_p00262295

If I remember this will stick anything to almost anything.

John

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chevrolux

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#1941272 17-Jan-2018 08:29

Little tiny 6mm holes with rawl plugs. Absolutely zero issues drilling in to a wall with that. It will be on the wall longer than you will be on this earth. 1000x better than any sort of glue.

timmmay

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#1941289 17-Jan-2018 09:08

I have those little plug things, I just don't really want to use them here if I don't have to. I've never drilled concrete and don't want to mess up a wall.

Might consider Gorilla Grip. I find anything that's single part I use a tiny bit then I can't get the lid off so I have to toss it away. Two part seems to solve that problem.

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xontech

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#1941290 17-Jan-2018 09:11

Max Bond or similar

http://www.hbfuller.com.au/products/trade/adhesives/256205081.html

StructureDr

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#1941299 17-Jan-2018 09:19

Attaching it to the concrete with screws would definitely be the best option - concrete (and concrete masonry, and brick) have really low tensile strength - so even if the glue is strong, there is a high likelihood that the concrete behind the glue will fail instead.

As said by others - drilling in with a masonry bit shouldn't cause any issues.

BTR

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#1941391 17-Jan-2018 11:00

Miracle bond, you can get it from trowel trades, costs about $25 a tube, it will set under water, holds like nothing I've seen before and dries rock hard.

Its an adhesive on steroids and will stick anything to anything.

its also a two part mix that mixes in the nozzle as it comes out.

elbrownos

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#1941396 17-Jan-2018 11:06

Araldite Super Strength lists "Fixing Dynabolts and metal rods into concrete" under its applications.

http://www.selleys.co.nz/adhesives/household-adhesive/araldite/super-strength/

Coil

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#1941406 17-Jan-2018 11:13

Physically fix it don't glue it, The concrete behind the adhesive will just perish and allow it to crumble away and fail like it already has.

Nylon wall plugs are the best and probably only option.

timmmay

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#1941430 17-Jan-2018 11:45

Since it's been there a couple of years and the concrete looks fine I will probably glue it again. Might have to get the stronger Araldite. Miracle bond probably more than I need.

If that fails then I'll have to get a masonry bit and think about doing it that way.

Thanks all.

neb

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#1941570 17-Jan-2018 15:15

SATTV:
I know you only want a small amount but what about gorilla grip?

https://www.bunnings.co.nz/gorilla-grip-construction-adhesive-10-minute-cure-310ml_p00262295

If I remember this will stick anything to almost anything.

The problem isn't bonding A to B, it's dealing with the fact that A is, by the sounds of it, crumbling concrete. If you really want to use glue rather than drilling in anchors, which I'd definitely go for, you can get sealants that penetrate the concrete and bind it, and then glue onto that. Google "anchoring adhesive".

Coil

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#1941571 17-Jan-2018 15:17

neb:
SATTV:

I know you only want a small amount but what about gorilla grip?

https://www.bunnings.co.nz/gorilla-grip-construction-adhesive-10-minute-cure-310ml_p00262295

If I remember this will stick anything to almost anything.
The problem isn't bonding A to B, it's dealing with the fact that A is, by the sounds of it, crumbling concrete. If you really want to use glue rather than drilling in anchors, which I'd definitely go for, you can get sealants that penetrate the concrete and bind it, and then glue onto that. Google "anchoring adhesive".

I've alawys had a hard time cleaning Liquid Nails off of concrete. Might work?

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