Good info.
Just curious, how much vacuum is being pulled and how long does it hold during a leak down test? Most likely not an issue, but possibilites need to be eliminated.
Another quick note as far as the laminate design, the fiberglass being used is a 0/90* non-woven, or non-crimp fabric (NCF), and probably of about 12oz/yd. It seems that there are no fibers on this part running diagonally, or corner to corner. On a part like this exposed to high temp from the sun, the resin will shrink and likely warp the piece. Even if it’s held down and the warping isn’t visible, it will be under stress.
Now to answer the questions.
Q: How do i stop the surface layer from lifting where the core edges are?
A: Not sure what is being asked. Surface layer as in the first ply, or the surface of your lay up (peel ply or flow media)?
I infused it sideways. I had 2 intake lines and 2 vacuum lines. All sideways to the part.
If that works then great, as it keeps the resin travel distance to a minimum. Personally, I’d run the feed line across the middle of the part and place a vacuum line on the front and rear edges. Alternatively, I’d feed the resin down the center along the length, and put a vacuum line on each side. A piece like this could be infused fully in about 5 minutes even with only 1 resin supply line.
What size tubing is being used?
I clamped off the line when it was fully infused.
This a a big problem I encounter when consulting with clients on their problematic parts. In reference to the underline above, it may look fully infused on the surface through the bag, but the side against the mold isn’t saturating as fast. Especially in this instance where there’s a solid core impeding the flow. I use cores with special features to combat this. ( Can’t give away everything!) As is evident on this part, the resin is indeed reaching the mold surface in most areas, but you still got some dry spots on the surface.
This can be a long post. What is between your layup and vac line openings? Is a vac pot
used between the pump and part? There should be a gap between the reinforcements and flow media of the layup, and the vac lines. Only peel ply should be in between. This allows air to go through without a problem, but is very hard for resin to flow through.
When the part looks like it’s fully infused, the resin should get to the edge of the fabrics of the layup and the flow media, and will encounter peel ply smashed between the mold surface and the bag. DON’T clamp off the feed line yet! Like anything, the resin will take the path of least resistance. If there are any dry spots remaining, the resin will go into them before flowing through the peel ply towards the vac lines. When it starts going through the peel ply only area, clamp off the resin supply.
The resin had a 25 minute pop life. I had it fully infused in about 11 to 12 minutes and had still about 10 minutes to spare after it was fully infused. As far as the specs it has a 25 minute pot life at 2% and that is what I used. Could the resin be too thin and running too fast and end up closing itself off?
As I mentioned above, a part like this should infuse in about 5 minutes with an optimal feed and vac line setup, and a resin of 500cps or lower. Can’t be too thin for infusion. When it seems like it closes itself off, resin will still flow into that area if the feed line is open. Clamping off the feed will not allow more resin into the laminate, and that dry area will have to try to fill in with the resin available in the laminate already, which is likely to not be enough.
As for flow media under the core, I highly recommend against it. Creates a very weak ply between the reinforcement and core. NCF’s are basically structural flow medias. You’ve already seen that resin can get under there, just have to figure out how to do it thoroughly.
I will keep your tab open, and send the bill later! 
