Hi,I'm new to this posting so I hope this comes up O.K.The bleed under the masking is easy to fix,spray whole plane/fus whatever in base colour allow plenty of time to dry.Use 3M fine line to mask,wipe down with wax and grease remover,then tack rag(this applies to every coat of paint) then,and this is the trick,spray a light coat of the colour you have just masked off,paying attention to hitting the fine line tape.When dry, spray the colour you want in that area.Try it you will see for yourself.