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Old 03-01-2008, 09:31 PM
K-36-canvasback K-36-canvasback is offline
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gelcoat substitutes

I am preparing to make a part in a mold.the mold surface is regular gelcoat & will be waxed with mold release.The part will be fiberglass hand laid into epoxy resin.I would like to know if there are other options for the colour coat.perhaps a two part polyurathane.am concerned that the epoxy wont bond to it or even if epoxy will bond to a polyester gelcoat.Anybody have experience with this?
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Old 03-02-2008, 03:55 AM
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Landlubber Landlubber is offline
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You can bond epoxy to polyester quite well, not the other waty around.
Epoxy over a poly gelcoat is quite OK.
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Old 03-02-2008, 03:02 PM
K-36-canvasback K-36-canvasback is offline
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Any idea about using Awlgrip or Endura for this same purpose.I was wondering if these two parters will lay onto the waxed mould or if there would be a negative reaction to the mould release.Also will the epoxy then bond to it without sanding?
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Old 03-02-2008, 06:24 PM
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Mate, you have no hope on earth of syraying a twp pack linear ployurethane paint onto a waxed mould.

It will fisheye like you have never seen.

Stick with the gelcoat, it is heap and good, and then paint the product upon release if you must.
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Old 03-02-2008, 11:38 PM
K-36-canvasback K-36-canvasback is offline
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Landlubber..Thanks for the info.I was wondering about the fisheye thing.Trial and error can get expensive!
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  #6  
Old 03-03-2008, 09:43 AM
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there is a product that is sprayed over jelcoat while it is in the mold & it is called POLYBOND . Douglas Marine /Skater uses this product , because they experienced bond issues with jelcoat on there ( epoxy ) parts G.G.
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