Medium super glue can be used (Zap a Gap) but needs to be sanded before it has fully cured (within 1 hour or so) as it becomes harder than the surrounding plastic after this time. Use with great care around clear parts as it can cause fogging. Masking the joint before filling and tape removal whilst the filler is still wet can minimise sanding. Remcogrobs suggestion could be used here too (in combination with masking) but check on a piece of sprue the affect of the polish remover (I haven't tried but would have thought acetone could well attack styrene in a bad way!).
There is another thread here I have just visited that touches on this very topic. The general consensus is that polish remover works a treat but pure acetone can be a bit harsh. Something new to try (if only I knew this before filling the gaping chasms doubling for joints on the Su-7's!).