OK, Here's some pics from layup day at the end of last month.
Everything ready to go, two layers of wax paper on the mandrel, glass wound on to a piece of ABS pipe, rocket retrieving pole as a turning bar, and my daughter ready to help wherever needed. Note the wax paper isn't super tight on the mandrel. This came back to bite me later.
Now we've got a wrap or two on the mandrel, and I'm adding epoxy from the cup, to be pushed flat with the roller.
This is one end of the tensioning system. The glass is wound up on the black ABS pipe, then a PVC pipe is clamped over the top (material doesn't really matter, it's what I had on hand). This puts weight on the material without allowing the glass to spool off of the ABS pipe. I think they were both 1.5" pipes.
Here's another view of the tensioning rig. The sledgehammer is there to keep the sawhorse from tipping over.
All done! Finished piece with a layer of wax paper over the top.
Dammit! The wax paper was loose enough that the glass on the bottom was falling away from the mandrel. Stand it up on end, bust out some scrap butcher paper from the "packing stuff into boxes" closet, and tape it all together to provide gentle pressure to hold the flats on to the mandrel. I didn't just tape it down because my first test piece had major wrinkles in the corner when I tried to hold it tight with tape. The paper here is carefully aligned so it only pushes on the flats, not on the corners.
I let that stand for not quite long enough, pulled it off the mandrel, pulled one layer of wax paper out of the middle to give some clearance to slide the tube off the mandrel later. At about that point, I discovered the epoxy was too soft and the whole tube was deforming under its own weight. Through some magic (and I'm not sure how it happened, really), we got it back on the tube to harden up a lot more. My advice now is to check it regularly and don't pull it off the mandrel until it's hard to slide the tube off the mandrel. That way, you're less likely to pull it too soon. After it had hardened for a day or so, I pulled the tube off the mandrel again and set it aside to cure for another couple of days.