Keeping Epoxy Warm

The brand of epoxy I use (Professional Epoxy Coatings from Fyne Boat Kits), needs to be kept above 14 degrees Centigrade for the pumps to work and ideally quite a bit warmer than that (about 20 degrees C) for it to flow properly.

Living in the UK, astride the European end of the Gulf Stream, our temperate winters don't merit heated - or even insulated - garages. My current workshop has single skin brick walls, a single skin metal 'up and over' door and a large roof space under an uninsulated slate roof.  This means that it is usually within a couple of degrees of the ambient temperature.

In our bit of UK, ambient in winter can range from -15 to + 12 degrees C, so I need something to keep the epoxy warm (storage inside the house not welcomed by the management for anything other than unopened containers).  In the past, I have kept it on a shelf above an oil-filled electric radiator; this worked, but the resultant utility bill hurt.

My current solution is to take a cheap plastic storage box (the type with hinged flaps as a lid) and mount it on the wall with a 60W light bulb hung from the top:

There is some old carpet draped over the top to reduce heat loss and the epoxy containers are sitting on top of a padded envelope with some airspace below to give some more insulation and get them closer to the bulb. 

With the bulb on all the time, this keeps the box at a constant 20 degrees C - ideal.

A couple of refinements:

The bulb is connected to the supply through a plug-in RCD trip switch as a safety measure:

and the 'doors' of the box are covered in black duck tape to reduce the incidence of helpful neighbours calling to say 'you've left a light on in your garage'. So this:

reduces to this: