I decided to fry my flow hive in pure bees wax, see pictures. I had enough (~2kg, not the 10kg I thought I had) to do this with a roasting pan/tray over a camping stove.
I only fried the pieces for five minutes each. This took about four hours! With a huge pan and plenty of wax, it could have been assembled and done in maybe half an hour.
The end pieces fitted into the roasting tray well, but the sides and lids had to be done half at a time. (see pics)
I don't recall any bees coming to visit while I did this, but that might be due to my setup. Bees are on the North side of my shed (I'm in the Southern Hemisphere) and I was about 20m to the South of my shed.
Two small issues I had (apart from the time it took!) were:
the wax wasn't as clean as I thought. So debris fried and became black and stained the wood where it was closest to the bottom of the roasting tray, but only on the surface. So I cleaned it off with methylated spirits.
at times the roasting tray moved to one side and I didn't notice. So the flame scorched the wood.
You can see both these issues in the top (first) picture.
I assembled the boxes without glue.
I intend to discuss elsewhere some minor issues in packing and minor points about the box design. I've already sent an email to customer support with suggestions, which they appreciated.
The bees are in the box now since the Jan 5.
I hold free bee workshops each month (Sept-Mar). So the next one people can see the Flow Hive too.
PS I did not use a thermometer, but only had the flame up enough to have the wax slightly boiling and I ladled the wax onto as much as I could of the large pieces of timber.