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Hazy GC50
Hazy GC50
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wochi
wochi
posted 9 Years Ago
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Well, the new order arrived today. And there is a big difference in color inside the container. The one I had is Orange, and the one that arrived is purple! Any reason for this? Maybe the one i had was too old or other formula?
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wochi
wochi
posted 9 Years Ago
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First of all thank you for your help!
Moisture it´s very unlikely to be the problem. It´s plain Summer Here (28º inside, 55% Humidity) and i have one filter just next to the compressor and another one close to the exit. I spray 2part lacquer with no problem and that usually is impossible with moisture in the lines.
I measure the catalyst with the Easycomposites dispenser, no rubber there.
It´s really hard to catch the problem in a photo. this is the best i can get
you can see it in the top left corner altough in person is visible everywhere
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Hanaldo
Hanaldo
posted 9 Years Ago
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I'm confident it will be moisture related. You can't necessarily rule out moisture being a problem because you have another type of coating that works fine; different chemicals react differently. I find polyester based coatings are especially sensitive to moisture. Hazy coatings are generally always a sign of humidity being too high for spraying, what is the humidity at the moment where you are? Also don't rule out moisture in the lines, I've gone through 3 different brands of filters before I found one that worked, and that's with a water trap in the line. Gotta empty the water trap every time before spraying, compressed air results in a fair bit of condensation.
Otherwise, I've seen haziness caused by a couple of other things too. Using a syringe with a rubber plunger to measure out your catalyst is a big one, the MEKP attacks the rubber and contaminates your coating.
Post some pictures if you can, always makes playing e-Doctor a bit easier!
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wochi
wochi
posted 9 Years Ago
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Did another part today, with half the gelcoat. It was so thin it opened some "holes in the mould" but as it was for testing to se if it was a thickness problem I proceed anyway.
Still the same problem. Hazy when i look from certain angles.
Any solution to this? I ordered 5kg of gc50 and seems that i won´t use it because it´s not acceptable to have parts like this!
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wochi
wochi
posted 9 Years Ago
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Hi Warren,
thanks for your reply.
I really don´t know how thick it was. First time using it. But it can´t be that thick as in corners you don´t see a huge layer of gelcoat. Also no drips in the mould when i sprayed.
Moisture is not the problem as the lines have filters and i use same line to lacquer my parts with no problem.
If it´s the thickness how can i know if i´m applying the correct amount of gel coat?
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Warren (Staff)
Warren (Staff)
posted 9 Years Ago
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How thick was the gelcoat? Also was it humid when you sprayed or let it cure? Both excessive thickness an moisture can cause a haze
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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wochi
wochi
posted 9 Years Ago
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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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