I have just encountered a problem that I am sure has been answered many times before but somehow a search in the forum brings back nothing. oops Apple iMac posted only part of the question. I have just produced a small curvy part and have a fairly bad case of insufficient resin penetration. The Vacuum was perfect, held for 12 hours before infusion and perfect afterwards. My suspicion is that the IN2 resin was not warm enough, it was below 20C and I used an electric blanket after infusion to bring the temperature up. I noticed on infusion a lot of de-gassing going on which settled after about an hour. Is it possible the resin was too viscous for the gas to be extracted fully and therefore prevent full resin take up. On the course we de-gassed and this gave a marvellous result. If a higher temperature can be achieved i.e. warming mould and resin up first what would be a good temperature to ensure a better penetration. I don't really want to have to buy a de-gassing setup if it can be avoided.



Retired - Thank heavens, and still don't have enough time during the day

Ok, if  you use flow mesh and restricted the feed line the issue is clear: you build yourself a degassing chamber!
A regular infusion has a pressure gradient: (almost) vacuum at the flow front, atmospheric pressure at the resin pot. The flow resistance of the hoses, the mesh and the fabric work against the instant equation. In reality there is steep pressure gradient at the resin front, and almost none over the rest of the part.
You restricted the resin feed line (pretty hard, 6 inches regularly takes me about a minute) so the (dynamic) flow resistance of the resin didn't build up a pressure gradient. Basically there is only one, steep gradient: at the restricted point of the hose. And this means, that your whole part is under almost full vacuum. Like in a degassing chamber.
In a regular infusion (Without degassing) the pressure is only in a small stripe  behind the flow front low enough to draw gas out of the resin.  In your case, the gas contaminated resin passes the clamped off section, degasses, and the gas is drawn through you part.
In my opinion there is no need to restrict the resin flow,  unless there are sharp edges in your part. And with proper degassing, there is no need at all to restrict the feed line. The faster, the better.