About the scotchbrite: toss it in and leave it in. Makes no sense fishing it out.
regarding this last bit I would say that bubble free resin is important but you will be incorporating bubbles in your resin front as you infuse with mesh or any other media. Take a look at the front next time and notice the bubbles in the mesh, this means that the reinforcement can be wetting out while there the voids in the mesh are not filled with resin yet, thus a more important factor would be resin front speed of infusion… if you race the resin front thru the part faster then the bubbles at the leading edge of the front can work their way out of the resin you will have bubble/voids(all the same I guess) in the reinforcement stack regardless of a bubble free resin…(although this does not mean the same thing as having bubbles in the resin you are infusing with though, it needs to bubble free.)
Indeed you are correct, if your flow front is too fast, it will also cause small void problems. There will not be any bubbles in the flow front if the resin is completely degassed. In Reality however, you cannot degas all the air from the resin as we have limited time after mixing and we have to draw a line at some point and say we have got enough air out of solution before you begin - and we see bubbles moving out of the front. There will always be a small amount still in solution. So provided the flow front is not too fast, and you degassed most of air from the resin, that is all we can reasonably do with simple apparatus. I always use the slowest possible flow media for this reason, it also wastes less resin - the only inconvenience is you cannot pull the resin as far and may require more feed lines at tighter spacing to get the job done…
I never felt the tiny amount of gas formation at the flow front caused any problems, not with impregnation or voids.
Indeed use slow mesh, especially with carbon. Keep in mind that quality is so much more important than speed. Especially with the low volume production that most of us do.
I have noticed i got small pinhole type voids when i was using a very low viscosity resin and warm temperatures, the flow was quite fast. When i slowed it down, things improved with no more pinholes and slight whitening of glass fibres, so this is all i have to go off… I read in a research paper that the infusion speed can vary the type of void, whether it be inter fiber tow or intra fiber tows depending on flow front speed. Seemed to be spot on from what ive seen… ill see if i can find the paper when i get some time…
Ah i saved it on my hdisk - here it is - well worth the read for anyone doing infusion, one of the best papers ive seen on the subject.
infusion thesis.pdf (4.19 MB)
Would you say that a slow media is better or the same as restricting the resin inlet speed ? I have a red airtech mesh(not sure what the speed of it is) and just pinch the inlet hose to my desired infusion speed given the various viscosities I use. The same thing is achieved no? I would imagine that both methods together would be used anyways.
Can you recommend a slow mesh? I have what I think is a green medium mesh.
Here is a selector sheet:
Who could sell me some Resinflow 60?
Herman can 
Thanks! 