How to paint thin straight lines?

I just painted a plaine with the yellow around the rear fusalage.. I maked and painted all my camo colors first.. did the yellow last.. didnt' have any problems with the darker paint... used 2 thin coats..... masked off with tamiya masking tape.. painted with Model Master Enamals.



http://home.dejazzd.com/delbert3/HS129/hs129page1.htm

Find a nice decal sheet of yellow, cut to fit. (make your own decal)!

yeah but if you are using dark colors like RLM 70 and 71 on the fuselage the yellow would have trouble covering it... I would paint the lighter color first then the darker, the opposite would be if it were a white fuselage, paint the white first, the mask the stripe on both sides and paint the yellow in between...

or do the reverse, that is get two pieces of tape and mask the line in between the two pieces.

I would probably paint the yellow frist, then cut a thin piece of tape with a straight edge and mask over the yellow and then paint your main colors.