Aluflash vs Flashband for UPVC roof alongside felt roof?

[sasolshares]

Hi all,
I am fixing a lean-to conservatory which abuts a flat felt covered roof. The end glazing bar runs diagonally along the flat roof facia. The flat roof has been formed into a bit of an upstand where it is in contact with the conservatory. I am looking for a self-adhesive flashing strip which will cover the joint between the felt upstand and the UPVC glazing bar cap and can be formed to follow the shape of the UPVC cap.
Any thoughts on whether to use Aluflash because it will hold its shape or Flashband because it may stick better to the felt roofing and is substantially cheaper?
thanks

 

[Xenon]

Ideally you should have a 150mm high upstand at any abutment then a cover flashing over that. Flashband is only ever going to be temporary, and it won't bond to mineral faced felt for long.

You coud try a liquid coating but preperation is all.