A.Lee wrote:

His recommendation was a torch on bitumen based sheeting, which would
last at least 10 years. Not really a DIY option as you need a big gas
torch to get it hot enough.

Not DIY? Try one of these:

http://www.machinemart.co.uk/shop/pr...1660-gas-torch

or better still:

http://www.machinemart.co.uk/shop/pr...-arm-gas-torch


--
Cheers,

John.

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