We ran into more problems with out "MegaTarp" this weekend and I need to make some repairs.
It is very similar to those blue plastic sheets that you buy from B&Q but a bit bigger. www.tarpaflex.com (see army tarps)
The existing seams appear to be made by folding the edge over and somehow sealing them I guess this is heat sealing.
Does anybody know how I could do this at home please?