Mr.David,
I use clear brushing wood lacquer in place of nitrate. It behaves the same, and I can get quarts from the local hardware store readily. Then I color/top coat for fuel-proofing.

Regarding Krylon...
This is one like "best engine oil" especially given that points in time of use make for differences in chemical content.
I think re-phrasing the question may sort out older "facts and folk-lore" and provide more current opinions/results.

Something like:
Who has used a recent Krylon, and from which of the Krylon lines did you purchase? Have you checked for fuel-proofing? Will you continue using it or was the experiment a disaster?

Thanks in advance.

Sideband...
I have a stash of older Pactra Aero-Gloss (which sprays over the lacquer just fine), but it is mildly affected by nitro as used in 1/2A. I don't let it bother me as my planes rarely fly around beyond a few seasons. I guess the "acquired all at once" stuff is the later not-so-fuelproof stuff of even earlier years.

Economy and ease of use are my driving requirements.
I think I'll be trying Rustoleum with a catalyzer next. This is because I have an antique vehicle that needs paint work. If the Rustoleum sprays on a model well and passes as fuelproof, then I'll try the same recipe for the car.
I expect I'll get the first two colors (packaged in the smallest cans possible), a thinner and catalyst. From there I can mix to desired hues. If this is a success, then I'll probably buy the primary colors, white and black. Then I'll learn to mix colors on demand by model.