Hi david, I made the stencil from a thin piece of plastic cut out with a small stanley knife. I firstly got the ARC logo printed out to the maximum size i could at office works which is about as right as original for mine cause i measured it before hand, Then i copied it for each letter with copy paper, copied it onto the thin plastic and cut out each letter into stencils.I measured up the erea roughly then stuck the cutout stencil onto cooler with double sided tape then spray away.
Hope this helps people it worked for me took me about 3 hours though to get it right.