Hazy GC50

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Hazy GC50

Hazy GC50

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wochi	wochi posted 10 Years Ago HOT Topic Details
Group: Forum Members Posts: 31, Visits: 188	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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wochi	wochi posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 31, Visits: 188	I appreciatte your help with the infusion but the point here is to try to understand what is wrong (or what i´m doing wrong) with the GC50 Gelcoat. So, i did my last test using brush instead of spraying. Hazy again! You can clearly see the paths left by the brush on top of the part. You can also see in corners (where is difficult to correctly spread the gelcoat) severe milky aspect. Conclusions: - not a problem with moisture in the spray gun - too thick gelcoat make milky/hazy results My problem still persists because i have already tried to spray much less Gelcoat (so thin it didnt even cover the all surface) and still got haze! Less than when i sprayed more gel but still haze I´m out of ideas... How can i spray an even layer of gel and get a full mould coverage? And how can this be recommended for brush application if it´s almost impossible to apply a thin layer without opening fisheyes?
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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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