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Thread: Repair of fiberglass fairing parts

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  1. #1
    Seattle-area Rounder OfficerImpersonator's Avatar
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    Repair of fiberglass fairing parts

    I did a search of all threads and didn't find an answer to my question.

    Does anyone have any experience repairing fiberglass fairing parts? The previous owner of my K75S had a very low speed low-side that put a bit of rash on the right upper fairing and a couple of cracks that go all the way through the side of the belly pan.

    I spoke with a friend who owns an autobody shop and he described a laborious and messy process of cutting out the bad parts and filling in the voids with many many alternating layers of glass and epoxy. He said I'd be itching for days if I attempted a home repair of fiberglass.

    Has anyone discovered or invented a shortcut? I would think that it would be easier to put some sort of patch on the back to hold the severed pieces together, and then use some sort of filler to fill in and conceal the cracks.

    I'll take some photos of the damage I'm trying to repair and upload them a bit later, as I'm sure that would further clarify the scope of my project.
    Seattle, WA
    2012 R1200GSA
    2002 R1150RT-P
    1992 K75S sold

  2. #2
    Registered User
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    Fairing repair

    I just recently repaired a 1987 K100lt that had been down on the left side. It is not very hard to get a good repair. I too had several cracks in upper, lower and rash on mirror. I took a dremmel tool with the little round sanding wheel and groung the back side of the crack. I went half way through. this makes a U shape furrow. I used an Epoxy putty. JB weld would do , but Bondo makes an Epoxy putty ( not Bondo body filler). After curing I ground the finish side the same way leaving a thin line of the epoxy on the back side. Fill with Epoxy. This will make a repair stronger than the original. Then lightly grind that in order to fill with Bondo body putty. sand 325 grit, primer, sand 600 grit, paint with color coat, do not sand, paint with clear coat, sand 2000 grit and buff. I had not painted in 30 years and my bike came out great. I used a PPG brand paint in Toyota dark grey mica.

    I believe the picture is #311 on page 21 of K bike pictures.

    Be sue to use Epoxy. Polyester is not strong enough. All frayed edges need to be ground or cut smooth if a hole is in the fairing. One pint of paint should give 2 coats of color, and then 2 coats of clear.

    You can look me up ans send me a message with your phone number and I'll call and answer ???????????

  3. #3
    3 Red Bricks
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    You might want to read this:http://www.largiader.com/k75/repair.html.

    I have had no experience using these methods, but it's the only article I have found.

    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  4. #4
    Curmudgeon nrpetersen's Avatar
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    Budding Geezer is right. You have to grind out and feather most of the the crack from the back side & then back fill it with layers of glass cloth and epoxy.

  5. #5
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    repair

    I have done extensive work with fiberglass, polyester and epoxy resins. It is incredible stuff but good prep work is essential. Roughing up, feathering out and using reinforcement over fillers is important to get a good bond. I've used several epoxies and prefer WEST becuz of its availability. its product line of fillers and technical information on usage. But it is expensive unless compared to the complete job at a body shop. The idea that paint doesn't hide anything is so true and working with basecoat/clearcoat is easy to use once you understand some things and follow the directions. I've recently rebuilt the "plastic" on a K1100LT and few will be able to tell what went on behind the scenes. Good lick and let us know how it goes1

  6. #6
    Seattle-area Rounder OfficerImpersonator's Avatar
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    This is all great information, and reassuring as well. Thanks to your advice, I think I'm going to give the repair job a try.

    Let's see what the wife says when I tell her I need to buy a Dremel Moto-Tool! Any excuse to buy a new tool...
    Seattle, WA
    2012 R1200GSA
    2002 R1150RT-P
    1992 K75S sold

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