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Thread: one off fenders cast from originals (fiberglass)

  1. #1
    Join Date
    Jan 2011
    Location
    Saskatchewan,Canada
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    95

    one off fenders cast from originals (fiberglass)

    i have a new set of fenders...i was thinking why not lay up some fiberglass on top the new fenders. They wouldnt have the flex like originals but would they crack and break on the forest trails with branches hitting them etc? Is there a flex agent i could mix into the fiberglass...input anyone?

  2. #2
    Join Date
    Aug 2008
    Location
    devore,ca
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    865
    I have a set of fiberglass fenders on one of my atc 70's. They look great but don't handle much abuse.
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  3. #3
    Join Date
    Jan 2011
    Location
    Saskatchewan,Canada
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    ok..good to know...i probably wont go that route then

    i thought there was some type of plastic that once heated would form to whatever shape a person wanted?

  4. #4
    Join Date
    Oct 2002
    Location
    Northeast
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    16,948
    Mine lasted 3 rides.

    My buddy got a set from the last batch, his broke too...

    Honestly, when guys are making them to sell, they aren't going to make them strong due to excess materials/labor and you'd never come buy to make more, like pharma's do with cancer drugs.

    If I were a fiberglass guy, I'd just add layers after layers, switching the grain etc etc and I'm sure they'd last allot longer than ones people sell us to make money...
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  5. #5
    barnett468 is offline FACT ! I have no edit button Arm chair racerThe day begins with 3WW
    Join Date
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    Quote Originally Posted by roonie View Post

    i thought there was some type of plastic that once heated would form to whatever shape a person wanted?
    There most certainly is, and it has been around since at least the late 1950's and is what a lot of car and truck interior parts were, and still are made out of. I had the toy below in the mid 60's that would do exactly what you are asking about. One of the stronger types of thermally moldable material is called SMC (for sheet molded compound) which is fiberglass reinforced polyester, and is what we used at Kawasaki to make the jet ski body parts out of, but you asked about hand laid fiberglass and I'm guessing something that one could easily use at home.

    https://en.wikipedia.org/wiki/Sheet_moulding_compound


    ...............................

  6. #6
    Join Date
    Jan 2011
    Location
    Saskatchewan,Canada
    --
    95
    yes...i have a brand new set of fenders ive had for years and wanted to use the shape of them to mold another set from. I just recall , somewhere , that there was a plastic sheet that when heated would go all floppy and fall into a form




    Quote Originally Posted by barnett468 View Post
    There most certainly is, and it has been around since at least the late 1950's and is what a lot of car and truck interior parts were, and still are made out of. I had the toy below in the mid 60's that would do exactly what you are asking about. One of the stronger types of thermally moldable material is called SMC (for sheet molded compound) which is fiberglass reinforced polyester, and is what we used at Kawasaki to make the jet ski body parts out of, but you asked about hand laid fiberglass and I'm guessing something that one could easily use at home.

    https://en.wikipedia.org/wiki/Sheet_moulding_compound


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  7. #7
    Join Date
    Apr 2012
    Location
    MI, USA
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    3,245
    My 1976 ATC90 had fiberglass fenders (factory I think), they were cracked in the corners by the seat, but otherwise looked great. It seems good sets can be made, but like it's said above, its going to take multi layers.

    Might not be the best example, but a lot of truck toppers are made of fiberglass, they are heavy but hold up well. Toyota even made one for their 86-89 4runner that's more of a SUV body, but the rear section had a removable topper. I'm not 100% sure if it's made of fiberglass, but it's just as heavy lol.

    The melted plastic sheet process I'm pretty sure is what Maier uses (vacuum molded). I wanted to poke around this a bit, but the larger parts would be quite a challenge to get a large enough oven for the plastic sheet and I have a lack of room for the molds. Maybe someday though, or someone else could attempt it =).

  8. #8
    Join Date
    Aug 2016
    Location
    East of Worcester ma
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    859
    Just messin’ around, I only had 3-chip clips and my younger son to hold it in a couple spots. A red Meier (sp) 200x front fender is underneath the maybe 4mm 2-part mix. Hmm not sure how to get it out now again I’m just playing, and the Black is difficult to take pics of. Maybe 6 guys and a vacume bag could do it but who knows.... alright I’m back to lurking...

    Click image for larger version. 

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    About a half hour set time so about 15mins into it you’ve got 5-mins of forming. I’m not recommending this I just thought it was interesting. I’m just happy it didn’t become a permanent part of my countertop.

    Shep

  9. #9
    Join Date
    Jan 2011
    Location
    Saskatchewan,Canada
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    95
    did you use a release agent?




    Quote Originally Posted by Shep1970 View Post
    Just messin’ around, I only had 3-chip clips and my younger son to hold it in a couple spots. A red Meier (sp) 200x front fender is underneath the maybe 4mm 2-part mix. Hmm not sure how to get it out now again I’m just playing, and the Black is difficult to take pics of. Maybe 6 guys and a vacume bag could do it but who knows.... alright I’m back to lurking...

    Click image for larger version. 

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    About a half hour set time so about 15mins into it you’ve got 5-mins of forming. I’m not recommending this I just thought it was interesting. I’m just happy it didn’t become a permanent part of my countertop.

    Shep

  10. #10
    Join Date
    Aug 2016
    Location
    East of Worcester ma
    --
    859
    Quote Originally Posted by roonie View Post
    did you use a release agent?
    Yes, I sprayed everything. This fender with a little trimming around the edges I maybe tempted to use someday. It’s very glossy too, the underside not so pretty though. Click image for larger version. 

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    The plastic had the consistency of a fruit roll up when I formed it if that makes sense.
    Shep
    Last edited by Shep1970; 05-09-2019 at 09:10 PM.

  11. #11
    barnett468 is offline FACT ! I have no edit button Arm chair racerThe day begins with 3WW
    Join Date
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    minnesota
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    Quote Originally Posted by Shep1970 View Post
    Just messin’ around, I only had 3-chip clips and my younger son to hold it in a couple spots. A red Meier (sp) 200x front fender is underneath the maybe 4mm 2-part mix. Hmm not sure how to get it out now again I’m just playing, and the Black is difficult to take pics of. Maybe 6 guys and a vacume bag could do it but who knows.... alright I’m back to lurking...

    Click image for larger version. 

Name:	1CC4F496-A827-4DD4-8968-07DC68AC5CAD.jpeg 
Views:	16 
Size:	1.72 MB 
ID:	258439 Click image for larger version. 

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Name:	C832D1FC-0E57-4064-99E2-B548C9944D5A.jpeg 
Views:	22 
Size:	1.69 MB 
ID:	258442

    About a half hour set time so about 15mins into it you’ve got 5-mins of forming. I’m not recommending this I just thought it was interesting. I’m just happy it didn’t become a permanent part of my countertop.

    Shep
    What plastic did you use exactly and what was the process?

  12. #12
    Join Date
    Aug 2016
    Location
    East of Worcester ma
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    859
    Quote Originally Posted by barnett468 View Post
    What plastic did you use exactly and what was the process?
    This link will show you what I used (bjb tc-808 jet black) process- just formed it over an existing fender while pliable. Sets up rather quickly. https://bjbenterprises.com/index.php...jet-black-a-b/

    Shep

    Really just mixed a+b dumped it on the counter let it run flat/level I’m guessing 3-4mm thick, let it set until not tacky then just picked up and layed on the fender molding/pressing while it set up stiff.
    Last edited by Shep1970; 05-09-2019 at 09:42 PM.

  13. #13
    Join Date
    Apr 2012
    Location
    MI, USA
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    3,245
    Looks like it came out pretty nice, who cares about the bottom side. Pretty neat idea, is that the normal usage for that plastic, or did you come up with that on your own?

  14. #14
    Join Date
    Jan 2011
    Location
    Saskatchewan,Canada
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    95
    Thats exactly the process im talkin about....now tell me, how tough a beatin will they take ...cause i hunt hard with my machine in the thick forests up here

  15. #15
    Join Date
    Aug 2016
    Location
    East of Worcester ma
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    859
    Quote Originally Posted by ps2fixer View Post
    Looks like it came out pretty nice, who cares about the bottom side. Pretty neat idea, is that the normal usage for that plastic, or did you come up with that on your own?
    Read roonies post yesterday and you guys were talking about needing heat for forming sheet plastic and this is what I came up with. Oh yes there is heat (chemical reaction) but just warm. I don’t “think” it would hold up to much abuse though. A front fender it’d probably be fine but rears I highly doubt it, it would probably be a bad idea. May work great for like side panels and things. I need a dummy fuel tank and may go this route. Or like a two-part mold for seat foams

    Shep

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