Dennis,
At the present time I'm going through just what you are asking about.  My new ship makes it impossible to choke the engine without getting raw fuel on the cowl.  The only answer right now is to invert the model after filling the tank and then choking and flipping the prop a number of times before returning it to it's wheels and starting.  Fine if you have someone to help but a real pain if you fly alone as I often do.  I ask Brett Buck who is the only person I personnly know who has use Klass Kote, and he was worried that it may yellow some over the white cowling paint.  I went to the local auto paint store to inquire about PPG Onmi clear and found that gallon was the smallest available container in my area.  Way too much paint and over $100 cost which really isn't too bad compared to other clear coats. Going to the Klass Kote website I found that they now have a 2 part clear coat in their product line.  Available in small quantities but at a fairly high price I've ordered some to try.  I intent to wet sand the entire cowl with 800-1000 grit paper and spray a couple of light wet coats spaced about 15 minutes apart on the cowl.  Should be ready to buff out the next day.
Alan Resinger   

               I don't know how you could prevent this, but I had this problem with auto clear twice now. The clear will harden in the container without the hardener. I had a whole quart solidify on me. This material goes a long way as it has the consistency of water. The air space in the container was enough over the course of a year to harden the material. This wasn't with PPG clear. My neighbor owns his own shop and provided me with 2 different types of auto clears which were given to him to use as samples. Nonetheless, these were not cheap in the event they needed to be purchased. Ken