How To Reinforce Cheap Plastic... - Chevelle Tech
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post #1 of 10 (permalink) Old Mar 5th, 19, 9:32 PM Thread Starter
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Brian
 
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How To Reinforce Cheap Plastic...

I have to replace the door lock/window switch panel on the passenger side in my mom's Astro van again (luckily I was able to find a brand new one that didn't cost a fortune). These things are made from the cheapest crap plastic known to mankind - I don't even think the plastic in a Yugo is this cheap.

Anyway, I am looking for suggestions on a way to reinforce 2 of the mounting points, to help prevent them from breaking (the 2 mounting points I need to reinforce are where the bolts for the inside door handle go through). If anyone has any ideas, your input will be greatly appreciated. Thanks in advance.
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1971 Malibu, factory buckets/full gauges/console, 377 roller cammed small block, Turbo 400, 3.42 10 bolt posi (Buick), - All your base are belong to us.

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post #2 of 10 (permalink) Old Mar 5th, 19, 10:32 PM
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Re: How To Reinforce Cheap Plastic...

You can buy thin plastic sheets at most Hobby Shops. Cut them to fit and superglue them down? -or- A thin (fiberglass) resin (only) reinforcement layer?
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post #3 of 10 (permalink) Old Mar 5th, 19, 10:33 PM
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Re: How To Reinforce Cheap Plastic...

can you find some plastic washers and glue them on??

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post #4 of 10 (permalink) Old Mar 6th, 19, 1:49 AM
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Re: How To Reinforce Cheap Plastic...

Epoxy putty.

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post #5 of 10 (permalink) Old Mar 6th, 19, 3:55 AM
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Re: How To Reinforce Cheap Plastic...

I don't know if this will work or if it's even what you are asking,

A Common fix for the door pull cup is to fab a piece of aluminum or steel to fit the bottom of the cup, drill the 2 screw holes and mount it up. This reduces the strain on the rest of the door parts/trim when the door is pulled closed.
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post #6 of 10 (permalink) Old Mar 6th, 19, 7:27 AM
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Re: How To Reinforce Cheap Plastic...

If you reinforce with more plastic, don't use superglue, use plastic model cement that acts like a solvent and they melt together. You can also plastic weld more on the back. Personally I would look to metal mesh/epoxy/fiberglass type of reinforcement after bending a piece of steel to match the plastic further in to the panel, not just at the first bend.
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post #7 of 10 (permalink) Old Mar 17th, 19, 12:09 PM
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Re: How To Reinforce Cheap Plastic...

Polyvance who used to be Urethane Supply Company, sells kits for both tab replacement and reinforcement (PlastiFix and FiberFlex, if my memory is correct). I've used them successfully in a number of repairs in my '93 Mustang years ago.

It may also be possible to get really creative and use a plastic repair kit and stainless wire mesh if you need lots of strength.
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post #8 of 10 (permalink) Old Mar 17th, 19, 8:27 PM
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Re: How To Reinforce Cheap Plastic...

J B WELD.

Everything else is garbage.
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post #9 of 10 (permalink) Old Mar 17th, 19, 9:15 PM
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Re: How To Reinforce Cheap Plastic...

Quote:
Originally Posted by DUTCH MAX HEADWORK View Post
I don't know if this will work or if it's even what you are asking,

A Common fix for the door pull cup is to fab a piece of aluminum or steel to fit the bottom of the cup, drill the 2 screw holes and mount it up. This reduces the strain on the rest of the door parts/trim when the door is pulled closed.
This is very similar to my idea. I would use Aluminum and JB Weld it to the backside. Maybe .032 gauge Aluminum.
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post #10 of 10 (permalink) Old Apr 2nd, 19, 1:10 PM Thread Starter
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Re: How To Reinforce Cheap Plastic...

Quote:
Originally Posted by hrspwrjunkie View Post
Polyvance who used to be Urethane Supply Company, sells kits for both tab replacement and reinforcement (PlastiFix and FiberFlex, if my memory is correct). I've used them successfully in a number of repairs in my '93 Mustang years ago.

It may also be possible to get really creative and use a plastic repair kit and stainless wire mesh if you need lots of strength.
Strength isn't the issue - it is just crappy plastic that cracks from being in the Arizona sun. The door handle attaches directly to the door steel, so it is not creating stress on the plastic. The lower door handle bolt does go through the hole on the plastic. Polyvance recommended their PlastiFix product, along with glass fiber cloth. I just ordered the PlastiFix (from someone other than the manufacturer, which allowed me to find a $5 off discount code - so I saved $21 total on the product), now I just have to find the glass cloth at a reasonable price.
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1971 Malibu, factory buckets/full gauges/console, 377 roller cammed small block, Turbo 400, 3.42 10 bolt posi (Buick), - All your base are belong to us.

My Chevelle w/ open headers: http://www.youtube.com/watch?v=Q61TTYXmIsc

My Chevelle w/ 2.5 pipes + X crossover/18 inch glass packs:
http://www.youtube.com/watch?v=YFm_ISn_UDA
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