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ChrisBcritter

CA glue and Jo-Han promo plastic

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Had a little surprise when I was repairing the windshield header on the '67 Chrysler vert a while ago. The header had a break which I drilled out and pinned to make a strong fix, and I dabbed on a small amount of Zap-A-Gap CA glue. When I was dabbing I noticed the green color of the plastic was coming off on the toothpick I was applying the CA with, and indeed the plastic melted a little bit when I put the parts together, just like regular cement does with styrene. I always thought CA didn't do that; is there something in Zap-A-Gap that affects some types of plastic? Over to the experts...

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Chris, there is some kind of solvent in Zap-A-Gap. I remember this from when I was doing my '59 Chevy WIP and there was something I needed the Zap-A-Gap for. I noticed the the plastic became 'soft' so I waited till it dried for a couple hours and then sanded things away. You'd think this wouldn't happen but it does.

I'm at work so I can't see the bottle and what's in it, but I wouldn't be surprised if it has a small amount of MEK.

EDIT: I just remembered what I was doing then. Whenever I'm doing opening doors, I like to put a bead of CA around the inside and outside perimeter of the door jamb where I glued the plastic for strength. It was when I wanted to speed things up a bit that I noticed the plastic became a bit soft after I put on the accelerator.

So yeah..........if you want to do this, consider letting it dry just like you would regular glue, although it doesn't take as long.

Edited by MrObsessive

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I don't ever recall any CA glue melting styrene, but liquid CA will readily start dissolving paint.

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27 minutes ago, peteski said:

I don't ever recall any CA glue melting styrene, but liquid CA will readily start dissolving paint.

I think he's talking about the accelerator you use to harden it up. I did have that soften the plastic......not the CA glue alone. And yes, CA can eat right into paint too. :o

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Thanks Bill! At least that will make the A-pillar joints a bit stronger. I'm being very careful working on this thing as I notice the plastic is brittle compared to some other promos. 

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On 2/28/2019 at 4:38 AM, MrObsessive said:

I think he's talking about the accelerator you use to harden it up. I did have that soften the plastic......not the CA glue alone. And yes, CA can eat right into paint too. :o

Ah yes, some brands of accelerators can easily attack plastic. They use things liek acetone as their solvent. Zap-a-Gap I believe is one such accelerator. That is why my go-to CA accelerator is the BSI brand. Very mild and will not attack styrene (even clear styrene).  It might slightly mar fresh paint, but not like the acetone-based accelerators.

Edited by peteski

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Got the windshield frame fixed OK; had to glue one end at a time and tape it down very carefully so it held. While doing so I also slid a piece of a clear vinyl bag over the windshield to prevent fogging.

Just need to find some matching dark green stock to make the vent window posts - I'd cut a couple pieces from under the chassis like I did for another Jo-Han promo but this thing is too brittle to chance trying to get the chassis rivets out.

Now to try to cast a hood ornament!  icon_eyes.gif.cc8921950f9ea052070d47eef9a98a53.gif

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