Some seams don't lend themselves to running the CA down very well. You can take a Q-tip and dip it in thin CA and run it over the seam then wipe the excess off. Clear polyurathane (comes in pint cans) from the pain section is fuel proof and works good with the Q-tip too. If it's the underside of the plane and you know it's going to get really slimed with oil I'll run the polyurethane over the seam and not even wipe the excess off. For the seam on the leading edges of the stabilizer and fin, if you know they are going to be a problem area you can run a length of Blenderm or other clear tape over that leading edge while the plane is still new and squeaky clean. You don't even see the Blenderm tape after it is applied. The clear polyurethane is a good alternative for coating the inside of the tank area and firewall with also. Just use a little disposable foam brush....

Ernie Misner