I'm afraid I'll have to chime in with the other folks here and go with take acetone/reducer and just simply take it off. If the finish underneath the plane is cured it will only take off the uncured paint. I don't believe I would try spraying another coat of anything on top of the mistake.... I found out the hard way that whatever the mixing ration is, that's what it is... creativity is NOT rewarded...

Dan
Carolina Custom Aircraft