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Old 11-12-2014, 07:33 PM   #1
CafeDude OP
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How to screw up R90S bodywork

OK, so this will be my "build thread" of sorts for refinishing my R90S body parts. It'll be a sloooow process because I do this in my spare time as a hobby, and I work a regular job all week. So don't expect this to be fast. I have a 1974 fairing, fender and seat that I will refinish and use to dress up a derelict /6. The rest of the R90S (non matching engine, so relax all you purists!) will live a cool but different second life, but let's not go there. The bodywork has the original silver smoke paint and gold plastic stripes, but in very sad shape. The pictures will tell the story. I've never refinished fiberglass before, so this will be an Adventure for sure. <--see what I did there? Anyway, here are the parts as I found them....you can see the condition is pretty bad due to some rough rides and an outdoor existence.





More photos to follow....
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Old 11-12-2014, 07:35 PM   #2
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Old 11-12-2014, 07:36 PM   #3
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Old 11-12-2014, 07:38 PM   #4
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Let the insanity begin. Started by spraying this chemical stripper onto the parts;



Let it sit for a while until this happened. Mommy!!!!

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Old 11-12-2014, 07:41 PM   #5
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Scrapped off the mess, re-applied the stripper, rinse and repeated, and massaged it with Scotchbrite pads, then washed it with lacquer thinner, then soapy water....until I got this;



So that's it for tonight. Time for some barley therapy!

Next up will be some metal repair to the seat cowl. I plan to tig weld the 2 holes closed followed by some metal finishing. I hate bondo, so I'll try to avoid it if at all possible.
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Old 11-12-2014, 07:50 PM   #6
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NICE!
Thanks
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Old 11-12-2014, 07:55 PM   #7
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Note that the front fender is white fiberglass, the fairing is black fiberglass, and the seat cowl is steel. Is this the way the factory cranked em out?

I still have to strip the rear fender. I assume that it's white fiberglass too? Not that it matters, just wondering....
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Old 11-12-2014, 08:08 PM   #8
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Yep

Quote:
Originally Posted by CafeDude View Post
Note that the front fender is white fiberglass, the fairing is black fiberglass, and the seat cowl is steel. Is this the way the factory cranked em out?

I still have to strip the rear fender. I assume that it's white fiberglass too? Not that it matters, just wondering....
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Old 11-13-2014, 06:44 AM   #9
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I think it's a mistake to chemically strip fiberglass. It's slightly porous and can trap the chemicals and outgas for some time. I had to replace my side covers because of it. I would wait a good while before priming at least.
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Old 11-13-2014, 07:32 AM   #10
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I think it's a mistake to chemically strip fiberglass. It's slightly porous and can trap the chemicals and outgas for some time. I had to replace my side covers because of it. I would wait a good while before priming at least.
You might be right. I'm expecting to walk into the shop today and find a puddle of fiberglass where I left these parts. LoL. If they survived through the night, my plan is to wash and rinse these parts in acetone one more time, then let them sit out in the sun a good long time before anything else. Good tip, thanks.
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Old 11-13-2014, 07:35 AM   #11
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I will be following this ..... These are my intentions as well. I ordered an S fairing through airtech though .....
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Old 11-13-2014, 07:38 AM   #12
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I will be following this ..... These are my intentions as well. I ordered an S fairing through airtech though .....
Cool. If you do the opposite of whatever I do, you'll probably be fine......
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Old 11-13-2014, 03:26 PM   #13
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I don't think the fenders are fiberglass. I've never seen a fender turned white with striping.

The tank is longer on an S bike. The R90S tank actually is the same as a /7 tank but has the flip up gas cap of the /6. So with the S seat you will have a large gap with the /6 tank. It might not be too bad but a /7 tank might fit better.

Interesting. Being challenged with body work I'll try to follow along and learn.
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Old 11-13-2014, 04:46 PM   #14
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I think you should be fine, I've striped a few BMW fenders with the KleenStrip Aircraft paint remover which specifically says on the back of the can to not use on fiberglass (ironically it also states that you should not use it on aircraft ).
After a good washing in Acetone or MEK followed by soapy water thay are all still holding paint well. I did seal them in a good quality epoxy primer prior to base coat / clear coat.
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Old 11-13-2014, 06:32 PM   #15
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