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Black plastics 16 Aug 2022 10:06 #872343

  • katit
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Talking about rear fender, chain guard and airbox. What is the good process for restoring?
Any way plastic can be polished? Or paint?

Bought can of PJ1 black plastic paint which I am thinking on using on airbox. 

What do you do for those parts?
78 KZ650B2A - resto in progress
www.kzrider.com/forum/11-projects/615161...s-1978-kz650-project
Other bikes: 1978 BMW R100/7, 1978 Moto Guzzi T3, 2016 DRZ400s

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Black plastics 16 Aug 2022 10:16 #872344

  • Warren3200gt
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I use a spray called black pack on anything black.  Works great on black plastic,  black vynil,  black paint. Not entirely sure what's in it but it sure works. It lasts a few months but if you make it part of your cleaning schedule it's not an issue. Spray on wipe off.  Simple.  

Z1000J2 somewhat modified!

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Black plastics 16 Aug 2022 11:19 #872347

  • Kelly E
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We use Back to Black, sounds like the same thing as Black Pack. Works great, spray on and wipe off.
The Rust Bros. Garage Collection
1974 Honda CB 550 K0
1975 Honda CB 400F Super Sport
1977 Kawasaki KZ 1000 LTD
1980 Suzuki GS 1100E
1981 Suzuki GS 1100E
1982 Honda CB 900F Super Sport
1983 Honda CB 1100F
1984 Honda Sabre 700
1984 Honda Interceptor 1000
1994 Kawasaki ZG 1000 Concours
And more
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Black plastics 17 Aug 2022 06:33 #872373

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I couldn't find PJ1 plastic paint, but if it's for plastic it should be fine.  FWIW, I painted the exterior plastic trim on my Ford Escape w SEM bumper coater >> that was almost 5 yrs ago & it's still intact w no chips or peeling or anything.  The rear bumper cover step gets a bit of abuse but there's not as much as a scratch.  For an airbox & chain guard I would look into the SEM Trim Black located in the Aerospace coatings section of their site.  I don't know how their plastic coatings stand up to solvents which could be an issue on a motorcycle, especially the chain guard.
 

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Black plastics 17 Aug 2022 07:22 #872375

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Well, I decided to give it a try (not sure why I typed PJ1, it's VHT) - VHT Duplicolor ESP820007 Black High Temperature Plastic Paint

It's for engine bays, and says UV resistant. So, who knows.. But chain cover looks much better. I will give it a try for fender and airbox.




 
78 KZ650B2A - resto in progress
www.kzrider.com/forum/11-projects/615161...s-1978-kz650-project
Other bikes: 1978 BMW R100/7, 1978 Moto Guzzi T3, 2016 DRZ400s
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Black plastics 17 Aug 2022 07:35 #872376

  • TexasKZ
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It certainly looks good. It will be interesting to see how well it holds up.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Black plastics 17 Aug 2022 07:36 #872377

  • Wookie58
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Looks really good Katit, lot's of plastic products are too shiny to look like plastic
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Black plastics 17 Aug 2022 07:44 #872378

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It certainly looks good. It will be interesting to see how well it holds up.

Thats main question. Also, hard to show on picture, but for some reason top of the guard ended up being more "flat". I painted at night maybe didn't put wet enough last coat. Anyways it looks day and night comparing to what it was.

I have this "back to black" stuff, but I don't really like how it works. You have to reapply it, and it works OK when it's discolored.

In case of this chain guard I spent probably 30 minutes just cleaning crud (underneath mostly), but top had dirt and stuff you can't just wipe off. So I did use some scotch brite pads and obviously scratched plastic.

This paint says NOT to do any plastic primer and not worry about sanding/scuffing. Just clean and degrease. If scuffing - 800 grit. Well, I sanded with 400 lightly and degreased. Paint covered it just fine with 3 coats, even some pre-existing deeper scratches. It smells funky, I assume there is some kind of chemical which fuses to plastic? Will see.

I personally sceptical about painting plastics, but for $15 why not? I don't have better choice, really..

It doesn't look flat/glossy like original, it looks more like modern Honda plastics.
78 KZ650B2A - resto in progress
www.kzrider.com/forum/11-projects/615161...s-1978-kz650-project
Other bikes: 1978 BMW R100/7, 1978 Moto Guzzi T3, 2016 DRZ400s
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Black plastics 05 Sep 2022 07:21 #873376

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As others said, that chain guard now looks really nice, I'd be delighted with that outcome.

Have you tried a sample to see if it's fuel resistant?

Ian

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Black plastics 05 Sep 2022 07:47 #873378

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No, I didn’t try if it’s fuel resistant. 
78 KZ650B2A - resto in progress
www.kzrider.com/forum/11-projects/615161...s-1978-kz650-project
Other bikes: 1978 BMW R100/7, 1978 Moto Guzzi T3, 2016 DRZ400s

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Black plastics 05 Sep 2022 09:30 #873384

  • urankjj
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If you choose to not use paint, a 50/50 mixture of boiled linseed oil and paint thinner gives great results on weathered plastics. It is quite flammable so be cautious with rags etc.  Happy detailing and Labor Day to all.
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Black plastics 05 Sep 2022 23:24 #873413

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Plasti-Dip might also be an option: www.nonpaints.com/en/spray-paints/plasti-dip
Also not fuel-proof sadly.
Ian

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