Here is some info from the H.O.K site:
DO NOT USE OTHER COMPANY'S HARDENERS, REDUCERS OR THINNERS IN OUR PRODUCTS.
REDUCERS
Reducers for Kosmic Kolor® Urethane Enamel & SHIMRIN® Universal Bases:
Our Kosmic Reducers - Ru-300 EXEMPT, RU-310 FAST DRY, RU-311 MEDIUM DRY, RU-312 SLOW DRY - are the only reducers we recommend for use with our Kosmic Kolor Urethane Enamel system. Used in the base, Kandy and clear coats, our reducers allow for:
excellent sprayability
fast staged release
good flow out and leveling
retention of gloss when dry
NOTE: Even with over reduction, the paint retains its gloss. Other reducers may cause dulling. This is especially true when any amount of over reduction has been attempted to even metallics or increase flow out.
THINNERS
Thinners for Kustom Kolor® Acrylic Lacquers:
Our Kustom Thinners 101 HI-GLOSS and 202 FAST DRY are the finest thinners you can buy at any price. The thinner carries the paint to the surface, then evaporates from the paint film. The way the thinner leaves the film determines the flow, tack free time, consistency, shrinkage, leveling, dry time, tape, time and final gloss.
Choose the thinner best suited to your shop conditions and the size of the object to be sprayed.
Our Thinners are- not cross referenced by any other paint company.
Just thought I would post this so you wont waste any time or paint! 8)