The current job is taking the roof off the workshop that Tim envied.
3.5m long rolled steel sandwich with 85mm PIR foam fill sheets.
The problem is the sealant strip used to weatherproof the lap. 10 years of sunlight and stitching screws every 0.5m have converted this to high tensile goop.
The hot air gun works but is tediously slow. Any magic potions out there?