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.

One test piece had been on the shelf for maybe six months.  After dripping fuel on it, and letting it sit for 30 seconds or so, wiping it off also took the gloss.  In some spots, it had a satin finish.  Other places it was dull.  I brushed on only one coat.  Maybe more coats would hold up better.

I picked up some Crystal Clear yesterday, I'll have to give it a try. I was pondering trying Sparkys Urathane on the nose for fuel proofing. My favorite local hobby shop is closing so now I don't know where I'm going to get fuel at. I was used to Omega, but can't find anyone that will carry it.  No one carries lusterkote around here now either. Now the closest hobby shop is an hour away which sucks!
I'll have to try Brodaks fuel and see how it works,  not to mention now fuel is a lot more expensive than the Omega I was getting. It's a shame so many local stores close up because of the internet.

Solvent based urethane is extremely fuel resistant. I've used Minwax a lot of times with good success.

I think Sparky uses a Automotive Urethane but not sure. I think he said in one of the hangouts that he uses dope thinner instead of the normal thinner for Urethane. I assume he still uses the hardner but not really sure .

The Brodak Crystal Clear is not fuel resistant no matter how long you let it cure.  It does polish out to a brilliant shine and does not yellow, but raw fuel will etch an area leaving it dull.  These marks are even difficult to remove by wet sanding with 2000 grit and polishing.  I've used it on several planes and I'm planning on using it on my current plane, but I think I will shoot the nose with a 2K two part auto clear.

Don

The Brodak Crystal Clear is not fuel resistant no matter how long you let it cure.  It does polish out to a brilliant shine and does not yellow, but raw fuel will etch an area leaving it dull.  These marks are even difficult to remove by wet sanding with 2000 grit and polishing.  I've used it on several planes and I'm planning on using it on my current plane, but I think I will shoot the nose with a 2K two part auto clear.

Don

Don I was looking at some of your pictures in the photo gallery and you do some nice looking airplanes!