I have been using peal ply on lay ups with and without bags with good results on carbon cloth. One of the headaches with carbon is knowing if it is wetted out since it doesn't go clear like FG and squeeging off the excess without distorting the weave. Peal ply solved both of those problems for me I can squeegie over the peal ply remove air bubbles, add resin to dry areas thru it and remove excess resin. It leaves a nice surface like it was bagged ready for a single fill coat without a lot of sanding thru the weave like a plain layup leaves and can be pieced on with overlapping with only a small line to sand away. Getting the results of a vacuum bagging without the extra steps or material. Resin infusion is fun you can spend all day making a bag perfect and completely sealed under vacuum before mixing the resin.

This is a hatch lip I cast under my deck after removing the peal ply no vacuum.

Hope the test in the tube goes well, those things usually need cutting on something to get better.