Krylon may be a little too thick, but any graininess can and should be sanded out using fine wet'n'dry.
fyi; I airbrush synthetic acrylic lacquer primers, I once used pressure packs but found they were too inconsistent.
Hi AndyErsek85, Your request set me on a search through my library to no great effect. Montforton doesn't deal with the wing spar or trusses in his book Spitfire Mk.IX & XVI Engineered ISBN: 978-0-9784001-0-1
However i did discover a web page which requires a subscription and fee paid which MAY...