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Post by bsmooth on Apr 29, 2020 6:06:00 GMT -8
I watched a video of doing a Dodge Charger from Angelo's Workbench, mostly meant for beginners. He did a lot of painting and then just glued the painted parts together without scraping the paint off first. he even glued a chromed air cleaner on without scraping the chrome off too. Years ago and I do mean quite a few years ago I thought you had to scrape off to the bare plastic to glue ? I think he used Testors Model Master glue in that weird shaped black dispenser.
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Post by tatocorvette on Apr 29, 2020 7:03:33 GMT -8
If it is plastic cement it is better to scrape off the area as it will not work properly on plated or painted surfaces. It may bond but be very weak.
Today, there are many adhesives available. For example I use CA (superglue) most of the time but it can fog the paint. If I need to glue an already painted part, depending in the location and the strength needed, I use simple white glue. For example antennas. For a stronger bond that will carry load or weight I use 5 minute epoxy. It will also depend on the material as now we have resin, metal and other materials where good old plastic cement will not work.
Thanks,
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Post by jchrisf on Apr 29, 2020 7:23:00 GMT -8
Like Ismael said about using white glue.. Testors has a clear plastic glue in a similar bottle so he might have been using that. It is for plastic windows so it doesn't fog. I love Angelo's Workbench.  |
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Post by bsmooth on Apr 29, 2020 8:08:46 GMT -8
He had painted the engine components like the alternator, and headers and he just glued them on the block which was orange. Maybe he had already scrapped them off? maybe I can email him and find out.
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Post by jchrisf on Apr 29, 2020 9:11:01 GMT -8
He had painted the engine components like the alternator, and headers and he just glued them on the block which was orange. Maybe he had already scrapped them off? maybe I can email him and find out. Yeah, post a comment on the video with the time it happened and he'll get back |
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Post by 4wheels on Apr 29, 2020 10:00:04 GMT -8
Tube-type model cement does not stick to chrome plating (not much does!), and when gluing a painted part, it will attack and bond to the paint but not penetrate thru to the plastic, so your bond is only as strong as your paint! Testors Clear Parts Cement is great for adding those late additions to a painted surface, where scraping may not be practical.
Brian
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Post by arcticwolf on Apr 29, 2020 10:23:37 GMT -8
I've had so many issues with parts not bonding even when unpainted that I mostly use various CA's for everything. I may use Tamiya cement to initially stick parts together, but I usually use a liquid CA after just to make sure it doesn't come apart. Normally it dissolves the paint enough that the plastics are bonded. Chrome is another issue onto itself. I agree, nothing sticks to chrome, at least not for long. Scrape the mating surfaces, its all you can do. Or just strip off all the chrome before you start, that's even better!
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Post by robhart on Apr 29, 2020 11:22:36 GMT -8
The 'Liquid Glass' cement sold by Scale Proshop/Laski Scale Specialties will glue painted and chrome parts together. Watch out for Testors Clear Parts Cement. I have had it turn yellow over time.
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Post by 4wheels on Apr 29, 2020 12:11:15 GMT -8
Watch out for Testors Clear Parts Cement. I have had it turn yellow over time. I've never seen that! I have 25+ year old models where I used that on their windshields that still look great. I also have a container of that stuff that has to be at LEAST 20 years old and I still use it! Testors Gloss White, on the other hand.... Brian |
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Post by Joel_W on Apr 29, 2020 12:26:50 GMT -8
I feel your frustration about glues. Even that simple process is so complicated to what it use to be. For gluing painted parts I use Tamiya's Extra Thin as it eats right through the paint. But by the very nature of that property it can ruin a paint job pretty quickly. So one needs to use it very sparingly. As others have said, CA and epoxies will bond painted surfaces, just takes longer.
Joel
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Post by bsmooth on Apr 30, 2020 8:05:58 GMT -8
I checked down the page on that build from Angelo's Workbench and some from New Zealand asked that question about glueing painted parts, and this was his response: Angelo's Workbench "nzspeedwayfan hello! You really should glue plastic to plastic but I don’t always. I really should though. Thanks for watching. "
I would have hoped If he was trying to teach beginners the right way of doing things, this would be sort of important. Funny part is he had a lot of corrections onscreen as the video was playing.
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