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Go Back   Madabout Kitcars Forum > Mad Build Area > Bodywork

Bodywork Share your thoughts, problems and ideas about bodywork related issues

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  #1  
Old 1st December 2021, 17:58
Mitchelkitman Mitchelkitman is offline
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Default Has anyone built themselves a GRP hardtop?

As title.... I intend to build a GRP hardtop for a roadster, with the shape similar to a soft top. Intention being to use it in the Winter. Wanting to keep the weight as low as possible, and a good enough finish to paint (probably matt black paint).
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Old 2nd December 2021, 09:00
kon kon is offline
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"a roadster"... as in, a z3? If so, should be able to buy all the clips and fixings for the hard top which they made for the car. Shouldnt be too hard to make a thin metal frame which connects all the bits, and then cardboard, parcel tape and grp to connect them. Same with an MX5, and with the price of those hard tops, I wouldnt be surprised if someone has done that a few times already.
I wondered if something like the lightyear fastback top might be a good starting point, if you can find one (or something like it) on this side of the world (light-year are aussie-based).
https://www.miataturbo.net/build-thr...-48089/page28/
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Old 2nd December 2021, 10:08
Mitchelkitman Mitchelkitman is offline
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Oops... sorry for causing confusion. It's a Calvy Mitchel (hence my user name). - old style roadster. Nearest equivalent is an NG kit car.
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Old 2nd December 2021, 18:26
Lucky@LeMans Lucky@LeMans is offline
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I've seen it done using a timber frame and 1/4" plywood clad with black vinyl. You could glass over the wood and then paint it, depends on what finish you want.
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Old 2nd December 2021, 20:06
Mitchelkitman Mitchelkitman is offline
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Thanks for your comments lucky. With your experience of GRP, do you consider a horizontal flat panel of the roof with a total of 1200 gsm chopped strand mat would sag over time? If so, maybe adding 5mm nidaplast honeycomb reinforcement and 450 mm layer under may stop it sagging? roughly 1m x 0.8m panel? I'll be grateful for your opinion.
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Old 3rd December 2021, 18:18
Lucky@LeMans Lucky@LeMans is offline
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I'm no GRP expert, best to talk to a laminator for their opinion.
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