Peter
I use Lazertran Inkjet Waterslide Decal Paper
www.lazertran.com
It is very thin and to be honest any thinner and it would be just about impossible to handle.
Like I said I paint an area with a brush which seems to work ok, but I guess you could spray. I did try using the printer but I found I got a better result by painting. Also you are using the correct colour of your choice and not limited by the choices on the computer.
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Because you're cutting a thin line the backing comes off with out the use of water.
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I apply with a brush Decalfix to the area and lay the strip in place then finish with another brush of Decalfix. After varnish you will only see the lining.
It is tricky but once to get the nack it's not so bad, but I think worth it.
Pete