I don't have the HOK tech sheets and have not used it in YEARS, but I do know that they have a "Mid coat" clear (basicly a colorless base coat) that is designed to spray over art work to "prolong" the window on the base and to "seal" the art work. I HIGHLY recommend looking into it. It is called "intercoat clear" and the part number is SG100.
Check it out
http://www.houseofkolor.com/hok/productset.html Click on "Kosmic Kolor urethane and polyurethane enamels" to see the "Intercoat clear" and it's discription. Have fun!
