Dry areas appearing when using GC50


Dry areas appearing when using GC50
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MarkMK
MarkMK
MarkMK
posted 10 Years Ago HOT
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Hi all
A couple of recently infused parts have demoulded with small dry areas of crazing on the part surface. I'd sprayed GC50 into the mould first, left overnight and infused the next morning.In both cases full vac was achieved and drop-tested for 30 mins before infusion
All other aspects of the process were adhered to carefully. If there was anything amiss I'd have expected to see any blemishes to appear below the outer gelcoat surface so was puzzled by the surface imperfections
Could it perhaps mean that I need to apply the gelcoat a little more thickly, as I'm usually concious of not spraying too much and creating sags or uneveness that might affect the appearance of the cured fabric. 
Thanks
Mark
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Dry areas appearing when using GC50
MarkMK - 10 Years Ago
     Are the parts de moulding easily? Is the crazing happening during removal? Alternatively, is it...
ajb100 - 10 Years Ago
     Could you quickly just clarify what you mean by crazing? I have heard people use crazing and...
Hanaldo - 10 Years Ago
     If you can take a photo we shall try and work out what is going on. Actual cracking would tend to...
Warren (Staff) - 10 Years Ago
     Hopefully the attached pic will provide a bit more insight. I'm guessing it's what's commonly...
MarkMK - 10 Years Ago
             It looks like dry spots from the infusion rather than a surface problem
ChrisR - 10 Years Ago
                 I agree, it does, but the imperfections have also broken the outer gelcoat when previously I'd only...
MarkMK - 10 Years Ago
     This also happened to me when I closed the entrance of the resin and after too much time the vacuum...
Jacopo Carbonio - 10 Years Ago
             I can understand it had I been shutting off the resin feed prior to the vacuum line, as you...
MarkMK - 10 Years Ago
     The picture looks like there are actual voids there not alligatoring. The voids are right through...
Warren (Staff) - 10 Years Ago
             A bit more info may be required: What's the stack sequence? How long did you pull the vac before...
ChrisR - 10 Years Ago
                 Sorry, no pics of set-up Chris, but will likely run another part this week. Stack was two plys of...
MarkMK - 10 Years Ago
     There is a note in that video that the formula for GC50 has been changed and acetone no longer works...
Brian_s - 10 Years Ago
     Yes the formulation changed meaning acetone does not activate it in the same way as before. Acetone...
Warren (Staff) - 10 Years Ago
             Doh! That'll teach me to pay closer attention. Thanks gents, glad I raised it now rather than just...
MarkMK - 10 Years Ago

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