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So just poured the epoxy (West System 105-209) no leaks - so far. MDF frame nail gunned and coated with two coats of sealer so hope it will come away neatly. Then mastic and clamped in place. 40mm wide and 30mm wide bridge, should give thickness of 5mm from 1Kg of 105. My wood drying kiln is on at the moment in the workshop providing some of the heat. It runs at 30 degrees and leaks out into the workshop. The rest of the heat provided by electric radiator and fan heaters. Started pouring at 16 degrees and its going up.