if its from 1989 maybe its time to simply build a new one?
My Kougar has so much fuel in the wing I have spent months trying to get it out and nothing will stick to the wood so I'm about to get a kit and start over.
There is a nice build thread on YouTube with a build -a-long of the Kougar. My next one will definitely have retracts, wish my King Kobra had them.
Bill S.