Hello my friends . I am happy to be a member of this forum for advanced composites .
In my spare time i make freedive blades from carbon fiber. After using many methods like closing first the vacuum line then after 30 seconds the feed line or the opposite first closing the feed line then the vacuum line to regain the lost vacuum , still i have pinholes / dry spots . In the link below you can see all the process in fast forward .You have to download it to see and the 30 minutes.

https://www.dropbox.com/s/xnmqseutrkk65lg/My%20Movie4.mp4?dl=0

The result of this process also had pinholes . I think that my fault here was that i closed the feed line quite early before the resin reached  the vacuum hose so it sucked the resin and made it poor.
Yesterday i made a new attempt with the same process with the difference that i didn't use the adhesive spray and also i  waited the resin to reach the vacuum hose and then i closed the vacuum line, counted to 30 seconds and then i closed the feed line.Unluckily the same results. I will take a photo tomorrow to see what i mean.
Today i made one more try witht hte diference that i waited 1 minute before i close the feed line to make it a bit resin richer ! Tomorrow  i will see the results.

Hi and welcome to the forum. 

First  point is you are using a lot of  unidirectional fibres.  UD can be a right pain to infuse because there is a lack of gaps between the fibres for the resin to soak through so almost certainly that would explain most of the reason you are having difficulties .  You would have more success if it was a stitched  UD like found in a biaxial or triaxial cloth as they have gaps between the fibre bundles which are stiched together. Whereas the UD you are using will be pretty much pure UD with either a binder or a fine internal supporting net to hold it together so virtually no gaps.

Also a second point, for  such a flat  work piece, you really should not need  a spray tack to hold it in place. - especially as you tape the edges anyway.


Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant