Here is the best price I was able to find on the rescue tape. Shipping is high for 1 roll($12.58) But it's the same price to ship 10 rolls. May be a good source for a group purchase....
Don

http://www.roadgiant.com/rescuetaperp25681x12mclffusingsiliconerepairtape-orange.aspx

----- Original Message -----
From: David Beierl <dbeierl@ATTGLOBAL.NET>
Date: Monday, May 3, 2010 2:54 am
Subject: Re: What a great thing the Vanagon List is...saved me a big   hassel today...long boring story

> At 02:31 AM 5/3/2010, Rob wrote:
> >Nashua Tape Stretch and Seal Silicone Sealing Tape, 1 In. x 10
> Ft., Black
>
> I'll have to check this stuff out.  Pending that, I expect that it's
> similar to self-fusing silicone tape I've used before, which is to
> say considerably lighter weight than the Rescue Tape.  When I first
> used the R. T. I was quite surprised by the amount of strength
> necessary to stretch it for application.  It's a Mil Spec product,
> normally 20 mil but obtainable (custom) from ten to eighty mil.
> <http://www.rescuetape.com/technical-data>
>
> Nope, I'm wrong.  The Nashua specs appear identical to the R. T.
> except they only offer black and clear.
> <http://www.emisupply.com/catalog/images/UPLOAD/File/Nashua386-
> TDS.pdf>
> I'll get a roll and compare them directly.
>
> Yours,
> David
>