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 Post subject: Making weak plastic more durable
PostPosted: Wed Aug 21, 2013 2:32 pm 
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I'm trying to take a relatively weak hollow piece of plastic and make it more durable. I want the color and shape to remain mostly the same. So I'm thinking some kind of clear coat could potentially work. I would think the coat would have to be kind of thick - certainly thicker than a few layers of paint. The coating wouldn't have to be perfectly even, but I wouldn't want it to have big glops or anything like that.

Is there some kind of substance capable of doing this?
I can show the result when I'm done if I'm ever successful.

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 Post subject: Re: Making weak plastic more durable
PostPosted: Wed Aug 21, 2013 2:37 pm 
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Can you "inject" some low viscosity two part epoxy material into the hollow of the part?

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 Post subject: Re: Making weak plastic more durable
PostPosted: Wed Aug 21, 2013 3:29 pm 
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I probably could. The volume of object is about 250 mL, so it may be a lot of epoxy - at least using the two small cylinder epoxy kits I've seen. Are there kits that would be larger volume?

I would still need to protect the outside as well though. It's something that would over time get dirty and wear out from hand prints and such. I would think some kind of spray may work for that maybe??

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 Post subject: Re: Making weak plastic more durable
PostPosted: Wed Aug 21, 2013 4:32 pm 
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Perhaps an expanding rigid foam for the inside.

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 Post subject: Re: Making weak plastic more durable
PostPosted: Wed Aug 21, 2013 5:04 pm 
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Tony Fisher wrote:
Perhaps an expanding rigid foam for the inside.


I think this could work, but if the plastic is too weak, couldn't the expandig foam break it?

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 Post subject: Re: Making weak plastic more durable
PostPosted: Wed Aug 21, 2013 5:58 pm 
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JackRTully wrote:
Tony Fisher wrote:
Perhaps an expanding rigid foam for the inside.


I think this could work, but if the plastic is too weak, couldn't the expandig foam break it?

I guess it's possible but I haven't used it for this kind of thing. Without holding the parts in my hand it's difficult to judge. I would have thought though if you don't put in too much, the hole you use to fill it will be enough to let excess out.

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 Post subject: Re: Making weak plastic more durable
PostPosted: Thu Aug 22, 2013 5:29 am 
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darryl wrote:
I would still need to protect the outside as well though. It's something that would over time get dirty and wear out from hand prints and such. I would think some kind of spray may work for that maybe??
You could use clear lacquer as the final coat.

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 Post subject: Re: Making weak plastic more durable
PostPosted: Fri Aug 23, 2013 12:03 pm 
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Hmmm... the expanding foam may work. When it hardens, I need to be able to drill into it. I'll try the clear lacquer too.
It will be a while until I can get to the project, but I'll be sure to show pictures if I can ever get it complete.
Thanks for all the suggestions!

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 Post subject: Re: Making weak plastic more durable
PostPosted: Fri Aug 23, 2013 12:29 pm 
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If it is the type of foam I am thinking about, then it is quite soft when it cures, so if you are expecting it to support something in the drill hole then you may have a problem.

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