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HELP - Resin beading / Fisheying on glass mould?
HELP - Resin beading / Fisheying on glass mould?
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HELP - Resin beading / Fisheying on glass mould?
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Warren (Staff)
Warren (Staff)
posted 9 Years Ago
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You should be able to polish the surface of the part if it has a matt surface from the mould.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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Hanaldo
Hanaldo
posted 9 Years Ago
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You want to remove it to a degree where you don't see it on the surface any more, it should look like it is gone. But you don't want to buff it so hard that you rub off the release agent.
You pretty much just hold the cloth loosely and rub it over the surface using minimal pressure until your mould is up to a full gloss again.
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Davie M12
Davie M12
posted 9 Years Ago
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I did buff it down but only fairly lightly as the directions said to be careful not to remove it completely?
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Hanaldo
Hanaldo
posted 9 Years Ago
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Did you buff the wax off after applying it?
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Davie M12
Davie M12
posted 9 Years Ago
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Thanks guys,
I tried with the wax & didn't have the "Fisheye" only issue is it has left a cloudy finish to the surface layer.
Any recommendations on how to improve this?
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Warren (Staff)
Warren (Staff)
posted 9 Years Ago
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Hanaldo is spot on again. EasyLease does tend to cause this effect during wet lay with thinner resins. Most gelcoats are generally fine but thinner laminating resins can fisheye in this way.
As said, a layer of mould release wax will reduce the "slippy" nature of the surface enough to help resin application.
If you are stuck in the situation then as the resin begins to thicken and gel then the resin is less likely to fisheye off the surface.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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Hanaldo
Hanaldo
posted 9 Years Ago
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That's the release agent. Easylease is a 'high slip' release agent, and it lowers the surface tension to a degree where liquid molecules adhere more to themselves than to the mould surface.
Unfortunately there's not a great deal you can do about it without raising the thixotropy of the resin. The best solution is to apply 2-3 coats of mould release wax over the top of the Easylease. This raises the surface tension again slightly, and can help. But in most cases you will still find the resin beads up. Realistically, brushing the resin flat until it starts to gel and hold its shape it the only real way to combat the problem, but it's not ideal.
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Davie M12
Davie M12
posted 9 Years Ago
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Hi Folks,
I'm having my first attempt at making some simple wet lay CF shapes and using a glass sheet bonded to MDF backing as a mould base.
The part is flat 100mm x 50mm and has a 10mm radius on leading edge which has been formed using polyester body filler.
I'm following the how to guides & have coated the mould with 6 layers of Easy lease and brushed on the is EL2 (slow) resin.
Problem is that the resin seems to be repelled from some areas of the mould leaving areas where there is no resin at all!
I tried brushing it back over the uncovered areas but it just keeps opening up again a few minutes after its covered.
I used digital scales to accurately measure resin ratios and am working in clean area at 20 deg ambient temp.
Any ideas?
Thanks,
David.
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9 Years Ago by
Warren (Staff)
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