Yes your right on that one - cheap fuel tanks and fuel tubing that slips off sends the fuel everywhere. I have had that problem with expensive ARF's not just cheap ones. Tanks and engine mounts are all cheap with almost any ARF. I wish the manufacturers would spend $5 more on these items - throw in better linkages also and have better planes. They can add the extra $5 to the price of the plane.

The Flecto varithane Pro oil based should be better than the Diamond. On the resistance chart the Pro looks like it can hold up to chemicals better than the Diamond. We have a guy at our field that uses the diamond also and he thinks it's great. He may have not sprung any leaks though and it's good to get some feedback before doing my plane.

How about a gasser. Will the gas eat through the Varithane?