Like George said, you can get it directly from SIG at this [link=http://www.sigmfg.com/cgi-bin/dpsmart.exe/MainMenuFV3.html?E+Sig]link.[/link]. I use BENOL from [link=http://www.clementsracing.com/item453246.ctlg]Clements Racing[/link]. BENOL is the castor component in Wildcat fuels and was used in the NORVEL NVX when Wildcat was mixing their fuel.

The SIG castor likely does just as well, but I've had good results with the BENOL.

the "other" andrew