Hazy GC50


Hazy GC50
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wochi
wochi
wochi
posted 10 Years Ago HOT
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Hi all,



i finished my first part today using GC50 gel coat. Poblem is that the part got hazy and on an yellowish side.
What could be the problem? I sprayed the mould with gel coat spraying gun, let it cure for about 4 hours (25º over here) and then epoxy infused. Into the oven, cured at 50º for 8h.
The primarly objective was to fill the pinholes that i allways get no matter how perfect is the insfusion, and that resulted very well! But when i look at the part compared with other with no gel coat is very noticable the difference. The yellow tone i can understand as beeing a polyester gel coat. But the haze is a big problem.
Any ideas for the cause of this?

Thank you!
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FLD
FLD
FLD
posted 10 Years Ago HOT
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Could this be gas in the GC50?  Superfine bubbles might not be visible as bubbles but would make a coating cloudy.  Spraying doesn't aerate a coating sufficiently to cause this as it picks up large(ish) droplets.  You could try degassing the GC50.  (just an idea).
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Hazy GC50
wochi - 10 Years Ago
     How thick was the gelcoat? Also was it humid when you sprayed or let it cure? Both excessive...
Warren (Staff) - 10 Years Ago
             Hi Warren, thanks for your reply. I really don´t know how thick it was. First time using it. But...
wochi - 10 Years Ago
             Did another part today, with half the gelcoat. It was so thin it opened some "holes in the mould"...
wochi - 10 Years Ago
     I'm confident it will be moisture related. You can't necessarily rule out moisture being a problem...
Hanaldo - 10 Years Ago
     First of all thank you for your help! Moisture it´s very unlikely to be the problem. It´s plain...
wochi - 10 Years Ago
     Well, the new order arrived today. And there is a big difference in color inside the container. The...
wochi - 10 Years Ago
     Very strange. Perhaps it had started to dry out? We sell a large amount of GC50 each month so the...
Warren (Staff) - 10 Years Ago
     upside down but you get the point. Can this be the problem? GC50 beeing too old? How can i see the...
wochi - 10 Years Ago
     did another part with the new GC50 and the problem is still there! It´s perfectly noticable from...
wochi - 10 Years Ago
     Personally I think solve the problem as to why you are getting pinholes, coatings are just a bandaid...
Hanaldo - 10 Years Ago
     Thicker gelcoats will reduce in clarity for sure. Also it looks like the orangy GC50 is pretty old,...
Warren (Staff) - 10 Years Ago
     I tryed both ways. Making a very thick coat and a very thin coat. I have measured the thickness and...
wochi - 10 Years Ago
     Well there's an issue somewhere along the line, as it's certainly possible (and very easy in fact,...
Hanaldo - 10 Years Ago
     Never tried that as like you said it´s not supposed to work like that. But can give it a shot. At...
wochi - 10 Years Ago
     Gelcoat doesn't ACTUALLY fix the pinholes though, they are still there underneath the gelcoat. And...
Hanaldo - 10 Years Ago
     the pinholes are barely visible at naked eye so i think they wont be a problem in the future. I´m...
wochi - 10 Years Ago
     Could this be gas in the GC50? Superfine bubbles might not be visible as bubbles but would make a...
FLD - 10 Years Ago
     To be perfectly honest, I think you have an issue with either your resin (too high viscosity) or...
Dravis - 10 Years Ago
     I appreciatte your help with the infusion but the point here is to try to understand what is wrong...
wochi - 10 Years Ago
     It does sound like you are applying it too thick or there is something else going on you haven't...
Warren (Staff) - 10 Years Ago
     Thanks Warren. I´ve been using the wax since the first test and it does help. Regarding the...
wochi - 10 Years Ago
     It depends on your compressor but you are wanting to be between 60-100PSI using the standard nozzle...
Warren (Staff) - 10 Years Ago
     so quantity is not the problem as i´m mixing 150gr for a 1/2 square meter mould... my compressor...
wochi - 10 Years Ago
     The "flow control" knob literally controls the flow by adjusting the pressure so there is...
Warren (Staff) - 10 Years Ago
     do you have any other video were it is beeing used and sprayed other than the bonnet series?
wochi - 10 Years Ago
     We don't have any other videos showing the cup gun in use and to be honest, I'm not sure what...
Warren (Staff) - 10 Years Ago

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