For what it is worth, this is my experience with it. I have used the Brodak Crystal Clear for topcoat because I wanted "clear", not something with amber tint that might look yellowish. The Brodak Crystal Clear is "clear" with no tint. The only issue I have had with it is that it has very little, if any, resistance to fuel. My fuel resistance tests were not that extensive. All I did was apply the clear to scrap pieces and then splashed raw fuel on it. If I did not wipe off the fuel almost immediately, there was a dull blemish.
One plane has a dull streak on the bottom where fuel dripped and ran down.
The Randolph non-tautening clear appears to have more fuel resistance. Not fuel proof, but more resistant than the Brodak Crystal Clear. Raw fuel did not produce the almost immediate dull blemish but over time even the Randolph clear would most likely give way to the fuel.