No unfortunately we don't have Atom Supplies here in Esperance, Paul.

Gee can I put my name down for a roll next time you go there?

I bought my double sided tape from Office works in Fremantle. It looks like clear sticky tape and is on a dispenser.
I had no luck with it though, as it wouldn't stick to "used sail cloth" no matter how you cleaned it up. Thinners included, it just lifted off all the time.
Some kind soul on this forum, suggested paper staples and this is a fantastic way to hold the old sails in position while stiching them. I lay them out over thick cardboard or white foam and just fire in the paper staples to hold the overlapping pieces.
Then gently lift the bits and fold the staples over to close them. They feed through the machine no problems at all.
Pull them out when you have finnished the sewing up.