Hi!
Sealing tape is no good!
Make a real good sealing by using 24 hour epoxy and Micro balloons.
You just mix a slurry of microballoons and 24 hour epoxy and put it on the fuselage.
Then you put some thin tape on the wing (where it meets the fuselage) and wax the tape (Mequiers carnoba wax for example) and then put the wing onto the fuselage ...wait 24 hours and remove the fuselage/wing and voila! A perfect fit!