If you want a nice finish with less sanding, and are willing to spend a few more bucks, Soller Composites also sells treated shrink-tube you can use instead of tape or peel-ply. You wet down the cloth (or sleeve), slip the shrink-tube over the joint, and shrink it down from the middle out to each end. That squeezes out the excess resin. Once cured, you cut and peel it off, leaving a nice, smooth surface.

Be prepared for sticker shock though. The treated shrink-tube costs more per-foot than the carbon fiber sleeving.

If you want to make a plug out of carbon fiber, the sleeving would work pretty well for that too.

Regards,
Eric