For years now I have been using a neoprene-based contact cement made by
Formica.  It is their product number 140.

Over 40 years ago I corresponded with an engineer at Formica and told
him what I was planing to do.  I still have his original letter
assuring me that Formica 140 brushable contact cement would be ideal
for pneumatic work in player-piano rebuilding.  I have never had a bond
failure with this product.

When an inner flap-valve spring wire broke and it was the type of
exhauster where the inner flap could only be reached by removing the
fabric covering, I pulled the covering off one side, repaired the
spring, recoated the removed cloth, and put it back together.  It is
still working fine today.

Since organic-based contact cement barely penetrates the gluing
surface, it is easy to sand off, if the need should arise.  As far as
PVC-E is concerned, I use it only to cover striker pneumatics and other
small devices.  I have given up on all the pneumatic cloth being made
today and am using polyurethane-coated nylon, sold by Schaff and
Spencer Chase.  It takes a little more effort and time to cover
pneumatics with this material, but it will outlast anything else and is
absolutely air-tight!

I know that this opinion will probably get me in trouble with the
purists, but I believe in giving the customer the longest-lasting job
possible.

Nathan Woodhull
S-k Piano,
Lima, Ohio