The 18, 21, 24, early 28's, and 32A's were all vinylester boats which had no problem with ethanol. When Skater switched to epoxy, the resin used specifically lists ethanol as a solvent, hence the problems on the newer boats. The price at skater is 7k for a 32. I know, I had it done.
Matts tank is aluminum and will still have issues.