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Go Back   Madabout Kitcars Forum > Mad Build Area > Tribute Automotive Builds

Tribute Automotive Builds Discuss your Tribute kit build

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  #1  
Old 3rd April 2016, 12:43
smash smash is offline
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Default Best way to cut GRP?

I need to cut the return lip down on my rear arches to clear the rear tyres - what's the best way to do it?

Should the exposed edge of GRP be sealed?
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  #2  
Old 3rd April 2016, 12:56
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Jaguartvr Jaguartvr is offline
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1mm steel cutting disc in an angle grinder, gives a perfect cut. You don't need to seal it. I make motorcade seats out of GRP and find that the cut edge of GRP just soaks up the paint, so much so that by the time you have a decent amount of paint on the edge the rest of the panel has so much paint on it that it looks like the surface of the moon.

I simply go over the cut with a Black wide chisel tip pen at 45 degrees, takes the "whiteness" away from the cut GRP.
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Old 3rd April 2016, 14:35
Mitchelkitman Mitchelkitman is offline
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I'd seal it with some GRP layup resin - given that it soaks up a lot of paint it would also soak up water? which when it freezes will damage the GRP.
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Old 3rd April 2016, 14:38
molleur molleur is offline
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I use gelcoat. Layup resin, gelcoat, or a skim of body filler will all work. The idea is to seal it from water intrusion. I really prefer gelcoat applied with a narrow brush. This allows a bit of extra material that may be easily sanded.
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  #5  
Old 3rd April 2016, 15:25
Lucky@LeMans Lucky@LeMans is offline
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Quote:
Originally Posted by Jaguartvr View Post
1mm steel cutting disc in an angle grinder, gives a perfect cut. You don't need to seal it. I make motorcade seats out of GRP and find that the cut edge of GRP just soaks up the paint, so much so that by the time you have a decent amount of paint on the edge the rest of the panel has so much paint on it that it looks like the surface of the moon.

I simply go over the cut with a Black wide chisel tip pen at 45 degrees, takes the "whiteness" away from the cut GRP.
The other way is to use a flap wheel is an electric drill so you can follow the profile of the arch without having lots of short cuts from a cutting disc.

Either way use a good mask or you with having chest problems for a month !
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Old 4th April 2016, 09:10
landmannnn landmannnn is offline
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I use a dremel cutting disc, then tidy up with a sanding drum on the dremel. As above, use a mask, every time I forget I get a bunged up nose for a couple of days.
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Old 4th April 2016, 11:38
Lucky@LeMans Lucky@LeMans is offline
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Originally Posted by landmannnn View Post
I use a dremel cutting disc, then tidy up with a sanding drum on the dremel. As above, use a mask, every time I forget I get a bunged up nose for a couple of days.
Its worse than that . I ended up coughing blood and a lung infection ! That was from less than two hours with a cutting disc on GRP.
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Old 4th April 2016, 13:05
smash smash is offline
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Bloody hell - this sounds dangerous!
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  #9  
Old 4th April 2016, 13:22
Mitchelkitman Mitchelkitman is offline
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The other options (avoiding high speed dust manufacture) are a hacksaw blade, or slightly faster (but not as accurate) one of the tungsten carbide grit blades, used by hand.
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