I, too, use the thin tosh from Heckshers, although it comes via a
secondary supplier.  It is ideal for the purposes.  I have had no
failures in 7 years but that is hardly conclusive.

The only criticism I would make is that it usually comes multi-folded.
The crease lines are clearly evident, and lose their initial colour,
so I worry about possible loss of surface rubber and sealing power.

When Steve Cox at Laguna Rolls provided material it come on a
cardboard roll.  Perhaps Steve knew something.  I think next time
I shall make a point of asking for that method of provision.

Roger Waring
The Pianola Workshop
Solihull, United Kingdom
www.pianola.co.uk