I enameled on copper and tried to decal images on enamel surface. I
put the work into the kiln and burn it out. 600F and only decal
paper is burnt out before melting enamel.
I took a quick look at the LAZERTRAN INKJET WATERSLIDE DECAL PAPER.
It appears to use ink and not glass. Check
http://www.theartfulcrafter.com/waterslide-decals-two.html on how to
apply to ceramics, I assume the same would work on enamels.
You are applying a paper decal not an enamel/glass decal and so the
firing temperature is much lower.
May you always enamel with passion in your heart
Schlaifer’s Enameling Supplies, LLC