F everyone's I, after 2 days cure time over homemade inkjet decals, a heavy coat of either Miracal Premium clear enamel (Co-op) or Plaid Patricia Nimocks Clear Acrylic Sealer (craft store) are proof against 15% nitro for at least 10 minutes.
Be sure there are no pinholes in the clear coat.
Seems they ought to be okay if Windexed after each flight.
May be extreme, but after 2 weeks cure, both sprays exhibited severe wrinkling following a fresh drop of raw fuel every 10 mins for ~40 mins.
Terry