Good day, vacuum infused a hood today. using vinyl ester resin. Top it with 1 layer of carbon 2x2 twill 5.7oz mat. Reinforcement of cm300 fiberglass mat, doubled it in some parts for extra strength. I used the usual tools peel ply, infusion spiral and infusion mesh same in the tutorial video. I had a tight seal on the bag. No air drops or leaks. Infusion went well. 

If the bag is good, then allow a bit more resin in.  Alternatively, slow the infusion down to give the resin more time to saturate the fabric as it goes.

It is quite easy to shoot across a panel and it looks done but hasnt fully soaked through with thicker laminates.  Also you can suck out too much resin sometimes.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Hi Warren, thank you for the reply. I have given the resin enough time to flow thru. Did you see my 3rd pic? Resin is has accumulated on the peel ply on the whole part. Another thing, In the middle of the infusion a lot of resin is building up on the silicon connector on the infusion side. Thank you

I agree with Warren, Had the same problem, slowing down the feed solved the problem.

When the resin enters the infusion mesh its fast during the 1st half, after the 2nd half the resin slows down specially after exiting it and into the fiberglass cloth. How do you slow down the resin anyway? Thank you

Only partially open the line clamp on the resin feed. That throttles it.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

To be honest, I don't think the issue is air. I think the issue is you are using vinyl ester resin. You can't infuse polyester or vinyl ester in the same way as you do epoxy, because it outgasses. Are you using a vacuum regulator? In the few vinyl ester infusions that I have done, I find this sort of thing always occurs if I infuse at full vacuum. You need to use a vacuum regulator to lower your vacuum level so that the gasses don't expand as much and leave these sorts of voids. 

I had this happen when it was a very hot day, resin over the entire peal ply but hadn't soaked through entire fabric... it was because the resin had started to 'gel' while still flowing through the part thus just flowed over it rather than through it.

Thank you with your comments. This also happened in a small part (side mirror) that I was doing. I have attached a photo.

Hi koko ...

Did you use GC50 as gelcoat on these parts too?   See your other thread on "clouding of GC50"

Btw... experience tells me that GC50 goes "milky" on "inside" surfaces exposed to air for a longer period, and if it delaminates, the result is the same..

I Coated a mould with CG50, then did not have time to finish with the epoxy wet lay planned, so the GC50 got left in the mould for 2 weeks in my workshop 

I had to remove it from the mould and start over...

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