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Old 12-28-2013, 03:41 PM   #1
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Fabricating a rocker switch panel

I'm fabricating a Switch Panel for rocker switches for my 2000 F350. The panel will be located in the cubby hole of the dash on the right side of the steering wheel.

I attempted to bond metal straps to plastic molding with JB Weld and used Gorilla Glue for the nuts. I glued the parts and let them dry for a few days before I checked to see if it held. As you can see, two of the brackets didn't hold. The Gorilla Glue is holding good, but I don't know how they will hold once I install threaded studs and tighten them up to the back of the cubby hole.




What adhesive is a strong-holding glue that is good at bonding metal to plastic?

I have found a thread (off the internet) discussing loctite, but, I was just wondering if anyone has used any other products, and how are they holding up?

Thanks in advance folks,

Rich
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Old 12-28-2013, 10:26 PM   #2
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My suggestion would be to ditch the plastic for aluminum, use a rivnut instead of bonding the nut to the panel with glue, and to attach the angles, then JB weld will probably work fine, but you could also rivet the angles on.
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Old 12-28-2013, 10:55 PM   #3
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The JB Weld will stick to the metal angle if you grind down the galvanise coating. The metal is too shiny smooth. I've bonded powder coated metal to fiberglass before but had to sand off the powder coating to get it to stick.

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Old 12-28-2013, 11:06 PM   #4
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I would use two part epoxy. Will bond just about anything.

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Old 12-29-2013, 12:02 PM   #5
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Quote:
Originally Posted by VanDiemen23 View Post
My suggestion would be to ditch the plastic for aluminum, use a rivnut instead of bonding the nut to the panel with glue, and to attach the angles, then JB weld will probably work fine, but you could also rivet the angles on.
Thanks for your input Van D, but, I'm going with plastic molding so that it will blend into the dash, a little.

Rich
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Old 12-29-2013, 12:13 PM   #6
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Quote:
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The JB Weld will stick to the metal angle if you grind down the galvanise coating. The metal is too shiny smooth. I've bonded powder coated metal to fiberglass before but had to sand off the powder coating to get it to stick.

Sammie.
I'm going to experiment with your idea, on a junk piece first, of grinding down the coating. I also heard of an idea of melting the plastic with a hot knife that I will be experimenting with also.

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I would use two part epoxy. Will bond just about anything.

ronspradley
Depending if those other methods don't work out for me, I'll look to the epoxy.



Thanks for your sharing your ideas Sammie and Ron,

Rich
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Old 12-29-2013, 12:52 PM   #7
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If you want it to blend in with the dash, then cover the aluminum with plastic - but use the aluminum for its ease of fabrication and structural capabilities, and the plastic just for cosmetics.

The type of plastic used will greatly affect it's ability to bond. You could make the panel and angles out of ABS or PVC and it will glue well with the stuff used for irrigation pipe.

You can get all kinds of sheet and angle plastic at McMaster-Carr
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Old 12-29-2013, 01:21 PM   #8
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Quote:
Originally Posted by VanDiemen23 View Post
If you want it to blend in with the dash, then cover the aluminum with plastic - but use the aluminum for its ease of fabrication and structural capabilities, and the plastic just for cosmetics.

The type of plastic used will greatly affect it's ability to bond. You could make the panel and angles out of ABS or PVC and it will glue well with the stuff used for irrigation pipe.

You can get all kinds of sheet and angle plastic at McMaster-Carr
I'm liking the structural and cosmetic idea. This is an idea I'm going to definitely try (on junk pieces first, of course).

Thanks Van D,

Rich
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Old 12-29-2013, 01:31 PM   #9
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You can get all kinds of sheet and angle plastic at McMaster-Carr

Hey Van D, I just went to the McMaster-Carr website and I gotta say, "That's a great site. Thank you very much."
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Old 12-29-2013, 01:42 PM   #10
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Consider using King Starboard. Comes in many thickness and colors. It does not glue well but machines with normal woodworking tools. Fastens with sheet metal screws.
Here is my latest project using it.
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Old 12-29-2013, 02:02 PM   #11
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I would use two part epoxy. Will bond just about anything.
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JB Weld IS a two part epoxy!

The OP said that he "attempted to bond metal straps to plastic molding with JB Weld, as you can see, two of the brackets didn't hold".
Two part epoxy may bond "just about anything" but according to the pictures the JB Weld bonded to the plastic but not to the metal brackets.

As others have written, the surface if the metal was probably not prepared/roughed up.

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Old 12-29-2013, 02:05 PM   #12
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Consider using King Starboard. Comes in many thickness and colors. It does not glue well but machines with normal woodworking tools. Fastens with sheet metal screws.
Here is my latest project using it.
Your project looks great.

Thanks for the idea and lead Ron,

Rich
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Old 12-29-2013, 02:24 PM   #13
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As others have written, the surface if the metal was probably not prepared/roughed up.

Mel
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Yes. I didn't prep the metal. I, did, put groove cuts in the plastic for the JB Weld to grab (maybe it helped, maybe not). It seems to hold.

I'll be prepping the metal this time.

Thanks for your input, Mel

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Old 12-29-2013, 04:02 PM   #14
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I would use two part epoxy. Will bond just about anything.

ronspradley
The last time I checked, JB weld was a two part epoxy. For best strength, don't use the JB Quick.
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