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 How To: Bring back the shine in plastic exterior trim parts

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BlackStar

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Posts : 312
Join date : 2011-12-19

PostSubject: How To: Bring back the shine in plastic exterior trim parts   Sat Dec 15, 2012 9:31 pm

Are your exterior plastic trim parts oxidized and faded? Mine were; it really made the car look all of its 25 years of it's age! I decided to do some experimenting on some black plastic parts, like my zenki eyelids, to see if I could bring back the shine. With just some polishing compound, I was able to bring a lot of life back into the part. I also tried the same technique on a side marker and the plastic trunk garnish, with all levels of success.

Today I deiced to take it further. I added more steps and different compounds, and made a how to. I would like to point out that my how to will not make a factory original finish. My guess is to attain that level of refinishing, a good amount of time wet-sanding would have to be done before hand.

Also, use this procedure at your own risk, I am not responsible for anything. I am simply showing a method that worked for me. And keep in mind, if you want the part to look like it just came from the factory, I THINK you will have to do a good amount of wet-sanding to take out any blemishes in the plastic.


To begin with, here is the part I will work on, a Zenki piece.




First, clean it off with a soapy solution(like dishwater soap)



After cleaning, it still looks terrible.



For this write up, I taped off half to show how much of any improvement. This first product I used was polishing compound with an applicator pad





follow the directions on the can.



After jsut this tep I notiec a huge imporvement



Next, I used ScratchX



here are my results after using



Before and after



I was not proactive in taking pics after this, so you will have to use your imagination. I decied I could improve upon what I had done.

First, I used rubbing compound, which is very very strong. I was dismayed at first, for after i rubbed the compound off, it looked liked a step back.

I then re-did my previous steps of polishing compound and Scratch X. I noticed after doing that, the plastic shine was much deeper!

I finished up wiht a coat of wax, which really improved the appearance.





My poor car's paint, why did someone rattle can it white? I would have been fine with the stock baby blue




And here is a lineup of the products I used. Also note, the driver side eyelid only has polishing compound applied to it, the passenger had the procedure I described above(the driver side had also been outside in the rain, keep in mind) I still noticed a much deeper shine, and I am pleased with the results. I'll update this thread with any other parts I do or re-do.


Sad :drink:
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SidewaysEightSix

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Car : 86' AE86/84' AE86/85' AE86/81' KP61/09' Scion xB
Posts : 286
Join date : 2011-07-12
Age : 26
Location : Peoria, Arizona

PostSubject: Re: How To: Bring back the shine in plastic exterior trim parts   Sat Dec 15, 2012 9:36 pm

wet sand would make them really look great.

also to add on this, for bumpers and textured black plastic pieces... Meguire's Back To Black works very well.
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BlackStar

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Posts : 312
Join date : 2011-12-19

PostSubject: Re: How To: Bring back the shine in plastic exterior trim parts   Sat Dec 15, 2012 9:48 pm

SidewaysEightSix wrote:
wet sand would make them really look great.

also to add on this, for bumpers and textured black plastic pieces... Meguire's Back To Black works very well.

I agree, wetsanding would make it look factory. That is good to know about back to black, I was just going to wetsand and spray the bumpers flat black with bumper paint.
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suprastarr

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Car : 85 corolla
Posts : 599
Join date : 2011-02-24
Location : usa

PostSubject: Re: How To: Bring back the shine in plastic exterior trim parts   Sat Dec 15, 2012 11:38 pm

BlackStar wrote:
SidewaysEightSix wrote:
wet sand would make them really look great.

also to add on this, for bumpers and textured black plastic pieces... Meguire's Back To Black works very well.

I agree, wetsanding would make it look factory. That is good to know about back to black, I was just going to wetsand and spray the bumpers flat black with bumper paint.

i used plastic fusion spray paint around my bumpers and it came out good i have pics of it im my build thread and great job on this man!
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yellowsnow4free

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Posts : 230
Join date : 2011-09-08
Location : Northern California

PostSubject: Re: How To: Bring back the shine in plastic exterior trim parts   Sun Dec 23, 2012 2:38 am

If I need to remove the part, I'd probably just repaint it Razz

That being said, the results in this write-up were pretty impressive; I'm definitely going to give it a shot on my AE86's eyelids (gonna tape off the bucket and do it on the car though Razz)

Thanks for the write-up! Smile
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