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manuelRSV
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Hi guys... I'm beginning to be very happy with the result I get with the resin infusion but I still have a problem ... in the photos I have attached there is a piece of a ducati 1098, the surface I think is of good standard but in some points there are "mysterious" and deep resin accumulation that I can't understand .. can you help me ?? Thanks so much Manuel (SORRY for my English..sorry !!!  )
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Dravis
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Hi!
Did you use GC50 before laying down the CF cloth, then infuse ? To me that looks like lumps of GC50 or other "in mould coating" -- The "milky look" does not look like normal bridging.
"Sapere Aude"... Dare to KNOW!
The written word is the only truly efficient vehicle for transmitting a complex concept from mind to mind...
103% of all people do not understand statistics...
Do not adjust our mind, theres a fault in reality :-)
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manuelRSV
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Group: Forum Members
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Hi Dravis... Thank's for your reply... Before laying down the CF cloth i use two/three hands of Wax and two hands of PVA. What's GC50 ??
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Dravis
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Group: Forum Members
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Hi! Check out the GC50 "Epoxy Compatible Polyester Gelcoat" in the EC catalog .. 
The only thing I can think of then is bridging --in other words: the Carbon cloth is not fully in contact with the mould, and the "void" has then been filled with cloudy looking resin,
Are you using PVA release on top of wax? -- I have very little experience with PVA release, but it sounds to me like that is not a good idea, I would expect the PVA to run off the wax, and form little puddles in some parts of the mould .. maybe that is what gives you the problems with the cloudy looking resin?
"Sapere Aude"... Dare to KNOW! The written word is the only truly efficient vehicle for transmitting a complex concept from mind to mind... 103% of all people do not understand statistics... Do not adjust our mind, theres a fault in reality :-)
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manuelRSV
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Hi.. I don't know but it might also be the problem....I will try not to use anymore the PVA. What do you use as release agent ? only wax ?
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Dravis
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Group: Forum Members
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Hi!
I mostly use EC "EasyLease" chemical release agent .. or just 5- 6- layers of EC wax ..
I never "mix" release agents ..
I spend a lot of time getting the CF fabric in to corners of the mould, drawing a bit of vacuum to ensure that the infusion stack (CF layers + peel-ply + infusion mesh) does not bridge any tight corners.
"Sapere Aude"... Dare to KNOW!
The written word is the only truly efficient vehicle for transmitting a complex concept from mind to mind...
103% of all people do not understand statistics...
Do not adjust our mind, theres a fault in reality :-)
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Matthieu Libeert
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Do you use any spray tack?
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manuelRSV
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hi guys... thanks for the precious advice, I will try not to mix release agents.. Sorry Dravis, why do you write that " the infusion stack DOES NOT bridge any tight corners " ?? |
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Dravis
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Group: Forum Members
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Hi!
What i meant was: I try very hard, and spend a lot of time making sure that the CF cloth is pushed fully into all the corners of the mould. Even spending a lot of time on this, sometimes I still get "bridging" in tight corners, but with a fully vacuum tight bag, and running the part resin-rich this usually is a minor cosmetic problem, leaving a thick cover of resin over the area where the CF cloth is not fully in contact with the mould.
The EC IN2 resin is so clear that it is just seen as a slight distortion in the weave. The resin surface follows the curve of the mold perfectly.. I'll try and post a picture later ..
"Sapere Aude"... Dare to KNOW!
The written word is the only truly efficient vehicle for transmitting a complex concept from mind to mind...
103% of all people do not understand statistics...
Do not adjust our mind, theres a fault in reality :-)
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Matthieu Libeert
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manuelRSV (27/06/2017)
hi guys... thanks for the precious advice, I will try not to mix release agents.. Sorry Dravis, why do you write that " the infusion stack DOES NOT bridge any tight corners " ??Matthieu.....i have see all your video even before to subscribe me in "talkcomposites".. you are like a ROCKSTAR, the ROCKSTAR of composites for me !!    I'm kidding but your work is amazing,a real inspiration !
So..i use always spray tack, a little bit on the mould and a little bit on the layer Glad you like my videos and looks like a nice part you are making! Try making a part without spray tack and all your problems will be solved I know it's much harder but use the vacuum to keep everyting in place at the end while bagging the piece. Noticed that the spray tack leaves a white tint to the resin on bridged spots. If just using resin it will be fully transparant in the worst case. What you could do is sand the "white" resin away till your back on the carbonfiber. Or do it again like I said without the spray tack I only use it when I'm sure I wont have any bridging issues
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