Lorin,

It seems like urethane clears apply over cured enamels and lacquers without a problem. I've been painting with cans in the absence of a compressor and found this stuff:

http://www.repaintsupply.com/pd_2_part_2k_aerosol.cfm

Looks promising, what do you think? Ingenious 2 part system in a can - never seen that before.

I also just found this interesting thread:

http://www.rcuniverse.com/forum/m_7591929/tm.htm

David.